produced/are becoming
have been producing/become
produce/will become
are producing/became E. were producing/will have become
Answer is Right!
Answer is Wrong!
The correct answer is: B. have been producing/become
The sentence is about the past and the future. The manufacturers have been producing electric cars for a number of years, but they are not yet
common. It is likely that they will become common in the future.Option A is incorrect because the simple past tense “produced” does not express the idea that the manufacturers have been producing electric cars for a number of years.
Option C is incorrect because the simple present tense “produce” does not express the idea that it will be a long time before electric cars become common.
Option D is incorrect because the present progressive tense “are producing” does not express the idea that the manufacturers have been producing electric cars for a number of years.
Option E
is incorrect because the past perfect tense “were producing” does not express the idea that it will be a long time before electric cars become common.