【題目】The spaceship _________ back some pictures since it reached Mars.

A.sendsB.has sentC.have sentD.sent

【答案】B

【解析】

句意:這艘飛船自從它到達(dá)火星已經(jīng)發(fā)送回來(lái)一些照片。

考查時(shí)態(tài)。send發(fā)送,sends第三人稱單數(shù);has sent現(xiàn)在完成時(shí),第三人稱單數(shù);have sent現(xiàn)在完成時(shí);sent一般過(guò)去時(shí)。由“since”確定為現(xiàn)在完成時(shí),主語(yǔ)為the spaceship為名詞單數(shù),故選B。

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