Question

16 mark for review which choice completes the text so that it conforms to the conventions of standard english? a has doubled b had doubled c doubles d will double founded in 1967 to foster political and economic stability within the asia - pacific region, the association of southeast asian nations was originally made up of five members: thailand, the philippines, singapore, malaysia, and indonesia. by the end of the 1990s, the organization ______ its original membership.

Explanation:

The sentence is about an action (the number of members doubling) that occurred before "by the end of the 1990s". The past perfect tense ("had + past participle") is used to show an action completed before another past time. "Had doubled" (option B) fits this context. Option A is present perfect, which doesn't match the past time frame. Option C is simple present, incorrect for a past - completed action. Option D is future, which is wrong as the action is in the past.

Answer:

B. had doubled