【題目】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】

句意：原子武器的第一次使用是在1945年，自那以后它們的威力大大增強(qiáng)�？疾闀r(shí)態(tài)辨析題。and 連接的是前后兩個(gè)句子。ever since和現(xiàn)在完成時(shí)態(tài)連用，意思是“從那以后到現(xiàn)在”，即since 1945。根據(jù)句意語境，可知選C。

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