Much progress ________in telecommunications during World War I, but the ...

[ Tenses ]

Much progress ________in telecommunications during World War I, but the basic technique________in the previous decades.

A. was achieved – had been developed

B. has been achieved – were developed

C. had been achieved – has been developed

D. would have been achieved – were developing

Select your answer:
A B C D E

Other quiz:

Grammar › View

The teacher spotted the students while they _____ classroom early.

A. left

B. had left

C. were leaving

D. are leaving

Perfect Tenses › View

I’m afraid the books you ordered………….. by Friday.

A. won’t have arrived

B. won’t have been arriving

C. will have arrived

D. will have been arriving

Conjunctions › View

This is the man ____________ had a car accident yesterday.

A. where

B. who

C. and

D. then

Past Simple & Past Continuous › View

This morning I saw Judy while she ______ her bike around the lake and ______ photos of some of the rarest birds in the world.

A. was riding/was taking

B. rode/took

C. was riding/took

D. rode/was taking