Which of the following italicized parts is a subject clause?

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【单选题】Whichofthefollowingitalicizedpartsisasubjectclause?

A、Wearequitecertainthatwewillgetthereintime.
B、Hehastofacethefactthattherewill,benopayrisethisyear.
C、Shesaidthatshehadseenthemanearlierthatmorning.
D、It'ssheerluckthattheminersarestillaliveaftertendays.

参考答案:

D

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