It is _____ he often fails in exams _____ makes his parents worried about him.
A．what; thatB．that; whatC．that; thatD．/; that
C

試題分析：考查強(qiáng)調(diào)句型和主語從句。強(qiáng)調(diào)句型it is/was... that去掉后不影響句意，據(jù)此排除B；根據(jù)makes可知，that he often fails in exams是主語從句，he often fails in exams是主謂結(jié)構(gòu)，不缺少成分，排除what；that引導(dǎo)主語從句時(shí)不能省略，排除D；故選C。
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