【題目】No matter when you study, you must ________ the subject on hand.
A.assist in
B.bend over
C.approve of
D.concentrate on

【答案】D
【解析】concentrate on sth.意為“集中注意力做某事，把注意力集中在某事上”。assist in doing sth.意為“幫助做某事”；bend over意為“彎曲，低頭”；approve of意為“贊同”。句意：無論何時，只要你在學(xué)習(xí)，你就必須集中注意力在你手頭上的科目上。故選D。

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