题目内容

It is    he frequently returns home late    makes his parents concerned about him.
A.because; thatB.that; that
C.不填; thatD.what; that
B
选B。考查强调句型。句意: 是他经常回家很晚使他父母为他担心。被强调部分that he frequently returns home late为主语从句。
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