________ some students are not aware of is ________ difficult life can be if they are not devoted to study.
A．That; howB．Which; what
C．What; whatD．What; how
D
D　句意：一些學生沒有意識到的是如果他們不專心學習，生活可能會是多么的難。“________some students are not aware of”為主語從句，該從句缺少賓語，表示“事物”且語境中并無選擇含義，故用what引導；“________difficult life can be”為表語從句，其中l(wèi)ife為主語，設空處后為形容詞，故用how引導。本題易誤選C項，考生誤以為第二空后的difficult life為名詞，故用what引導，但是如果那樣的話“________difficult life can be”便沒了主語，也就不能成為一個從句，第二空如果填what，應改為：what difficult life it can be。
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