【題目】—I'm sure John will win first prize in the competition. —I think so. He ________ for it for months.
A.is preparing
B.was preparing
C.had been preparing
D.has been preparing

【答案】D
【解析】本題考查時態(tài)。由for months可知此處用現(xiàn)在完成進行時表示近段時間一直在做某事。句意：——我確信約翰會在競賽中獲一等獎�！乙策@樣認為。他這幾個月來一直在準備。故選D。

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