______ I want to know is how long it will take to finish the building.A、ThatB、W

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问题 ______ I want to know is how long it will take to finish the building.

选项 A、That
B、Which
C、What
D、Whether

答案 C

解析该题考查考生对what引导的从句的掌握。在该句中，what引导的从句当主语。what引导的从句还可以当宾语、表语等。

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