2. 外语
  3. Your experiment reports must be checked with care before ______.

Your experiment reports must be checked with care before ______.

admin2008-11-13  102
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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成人本科学位英语

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