Your experiment reports must be checked with care before ______.A、handed them in

游客2025-03-16 2

问题 Your experiment reports must be checked with care before ______.

选项 A、handed them in
B、them handing in
C、being handed in
D、handing them in

答案 C

解析 before后要加动名词且是被动的。

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这件事发生在我们出生以前很久。Thateventtookplacelongbeforewewereborn．