【題目】John's success has nothing to do with good luck. It is his hard work __________ has made him what he is today.

A. why B. when

C. which D. that

【答案】D

【解析】考查強(qiáng)調(diào)句型it is/was. that. ，被強(qiáng)調(diào)部分為his hard work。

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