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

Your experiment reports must be checked with care before

admin2019-07-18  17
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 本题测试非谓语动词的用法。before为介词，后面接动名词，根据题意应用动名词的被动式。本句的意思是：“你的实验报告在被递交前必须经过仔细检查。”
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