Don’t put off till tomorrow ______ you can do today.

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问题 Don’t put off till tomorrow ______ you can do today.

选项 A、that
B、what
C、when
D、whether

答案B

解析 引导宾语从句及其他名词性从句时,that和whether在从句中不充当成分,而what和when要充当成分,what常在从句中充当主语或宾语。该句中what在从句中作宾语。
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