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【单选题】

They had fun ______ s in the park.

A.
play
B.
playing
C.
plays
D.
played
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参考答案:
参考解析:
.
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举一反三

【单选题】_____ when the light went on last night?

A.
What were you doing
B.
What have you done
C.
What did you do
D.
How were you doing