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
選B�？疾閺�(qiáng)調(diào)句型。句意: 是他經(jīng)常回家很晚使他父母為他擔(dān)心。被強(qiáng)調(diào)部分that he frequently returns home late為主語從句。
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