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(单选题)

The students are studying hard, for they know ______.

A.what are they studying for

B.what are they studying

C.what they are studying for

D.why they are studying for

参考答案:C

参考解析:

考查宾语从句的语序。句意:学生们在努力学习,因为他们知道他们在为谁学习。宾语从句应使用陈述语气,排除A项和B项,D项for后面缺少介词宾语,why只能充当状语,应使用what。故选C。

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