The first use of atomic weapons was in 1945, and their power________ increased enormously ever since.

1. A.
   is
2. B.
   was
3. C.
   has been
4. D.
   had been

The first use of atomic weapons was in 1945, and their power ____increased enormously ever since.

A. is   B. was  C. has been  D. had been.

The first use of atomic weapons was in 1945, and their power ________ increased enormously ever since.

A. is             B. was   C. has been        D. had been

The first use of atomic weapons was in 1945.And their power _______ increased enormously ever since.

A. is B. was?

C. has been D. had been?

The first use of atomic weapons was in 1945. and their power _____ increased enormously ever since.

A. is               B. was             C. has been      D. had been

The first use of atomic weapons was in 1945. and their power ______ increased enormously ever since.

A. is                          B. was                       C. has been                    D. had been

The first use of atomic weapons was in 1945 and their power ____ increased enormously ever since．

A．is          B．was         C．has been          D．had been

The first use of atomic weapons was in 1945 and their power__       increased enormously ever since.

A. is       B. was        C. has       D. had been