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I ________ a topic for the composition, but haven’t decided yet.
A．will think aboutB．have been thinking about
C．had thought about D．was thought about
B

試題分析：考查時態(tài)：句意：我一直在考慮作文的話題，但是還沒有決定呢。從but haven’t decided yet.可知是從過去到現(xiàn)在一直在想，還沒有決定，表示動作從過去到現(xiàn)在一直在進行，可能還是要進行下去，用現(xiàn)在完成進行時，選B。
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