He doesn’t stop working ______ he finishes his work.

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问题 He doesn’t stop working ______ he finishes his work.

选项 A、as
B、that
C、till

答案C

解析考查句型。not…till…为固定搭配，意为“直到……才……”；us表示原因或当……时候，不能与not构成这一句型；that一般用来引导各种从句。所以答案为C。[知识拓展] not… until…可以表达同样的意思，二者可以换用。因此也可以说：He doesn’t stop working until he finishes his work．

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