【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(shí)態(tài)。由for months可知此處用現(xiàn)在完成進(jìn)行時(shí)表示近段時(shí)間一直在做某事。句意：——我確信約翰會(huì)在競(jìng)賽中獲一等獎(jiǎng)�！乙策@樣認(rèn)為。他這幾個(gè)月來(lái)一直在準(zhǔn)備。故選D。

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