问题
选择题
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
答案：C
and 连接的是前后两个句子。第二句中的their power 为主语。
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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
and 连接的是前后两个句子。第二句中的their power 为主语。