[题目]The first use of atomic weapons was in 1945, and their power increased enormously ever since.A. is B. wasC. has been D. had been 题目和参考答案——青夏教育精英家教网—

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【题目】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

【答案】C

【解析】考查现在完成时。现在完成时表示到现在为止完成了。现在完成进行时表示从过去持续到现在，而且还有可能延续下去。

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