Question

(a)
(1) a hybrid vehicle uses at least two different sources of power, you have probably seen examples of hybrid vehicles without realizing it. (2)some types of trucks or buses, and some trains use a combination of diesel fuel and electric power. (3) the most common hybrid cars in use today combine gasoline and electric power.
(b)
(4) there are two primary types of hybrid engine designs: the parallel hybrid and the series hybrid. (5) in both kinds electric motors and gasoline - powered engines. (6) in the parallel hybrid design, the electric motor and the gasoline engine can power the car together or independently. (7) in the series - hybrid design, the gasoline engine does not power the car directly. (8)instead, it run a machine called a generator that charges the batteries or powers the electric motor. (9) the electric motor actually powers the car. (10) however, the car cannot move unless the gasoline engine is on. (11) one of the benefits of hybrid cars is their fuel efficiency.
(c)
(12) in some hybrid models, the gasoline engine is used only when the car will move faster than 15 miles per hour. (13) that reduces fuel consumption in heavy traffic. (14) the designers who have created the hybrid car have tried to increase its efficiency in every way they can think of. (15) hybrids are made from lightweight materials. (16) it is designed to drive smoothly, without being slowed down by things like wind, and even the tires on hybrid cars are designed to make the car run as efficiently as possible.

1. sentence 12: in some hybrid models, the gasoline engine is used only when the car will move faster than 15 miles per hour.

which correction should be made to sentence 12?
o a remove the comma
o b change is used to is being used
o c change will move to moves
o d change faster to more

Explanation:

The sentence is a general - statement about the operation of hybrid models. The present - simple tense should be used for general truths. "will move" is in the future tense and should be changed to "moves" to express a general fact.

Answer:

C. change will move to moves