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He often helps the students _______ he thinks are not quick at their studies.

 He often helps the students _______ he thinks are not quick at their studies.

      A．whom   B．who       C．when     D．because

A．whom

B．who

C．when

D．because

He often helps the students ________ he thinks are not quick at their studies．

A．whom

B．who

C．when

D．because

He often helps the students ________ he thinks are not quick at their studies.

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