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

My father _______ carry me on his shoulders when I was a child.

A. can

B. would

C. should

D. may

Idioms › View

I know you are upset about breaking up with Tom, but there are plenty more…………………….

A. horses in the stable

B. cows in the shed

C. tigers in the jungle

D. fish in the sea

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