这个英语题为什么选B不选AHe often helps the students ( )he thinks are not quick at their studies.A whomB whoC whenD because

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这个英语题为什么选B不选A
He often helps the students ( )he thinks are not quick at their studies.
A whom
B who
C when
D because

he thinks 作插入语,可以去掉,原句变为He often helps the students ( )are not quick at their studies,这就很显然了,要填的词做主语,当然只有 who符合了,whom只能作宾语.