The first use of atomic weapons was in 1945.And their power _______ increased enormously ever since.
A．isB．was?
C．has beenD．had been?
C?
此題考查時態(tài)的用法。前面講1945年首次使用原子彈，而后面一句無確定的過去時間，但ever since確定了應(yīng)選C項，因為ever since和完成時態(tài)連用,指的是“從那以后”，即since 1945。
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