题目内容

He kept looking at her, wondering whether he ________ her somewhere.

A. saw
B. has seen
C. sees
D. had seen

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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

bus的 复数是_____ .

sheep的复数是______。

woman的复数是______。

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