16．The reporter said that the UFO           from the east to the west when he saw it．（　�。�
A．was travellingB．travelled
C．had been travellingD．was to travel

分析 記者報(bào)道說，當(dāng)他看見UFO的時(shí)候，它正在由東向西飛行．

解答 答案A．
B項(xiàng)"一般過去時(shí)"表示發(fā)生在過去的動(dòng)作；C項(xiàng)"過去完成進(jìn)行時(shí)"表示持續(xù)到過去某時(shí)的一個(gè)動(dòng)作；D項(xiàng)"過去將來時(shí)"表示從過去某時(shí)看來將要發(fā)生的動(dòng)作或存在狀態(tài)；A項(xiàng)"過去進(jìn)行時(shí)"表示在過去某一時(shí)刻或某一段時(shí)間內(nèi)發(fā)生的動(dòng)作；根據(jù)題干中的"when he saw it"可知，在過去的某個(gè)時(shí)刻，即"我看見的時(shí)候"，所發(fā)生的事情，在那個(gè)時(shí)刻UFO正在由東向西飛行，所以應(yīng)該用過去進(jìn)行時(shí)，故選A．

點(diǎn)評 本題考查時(shí)態(tài)辨析．解答此類題目首先要讀懂句意，捕捉信息，理解情境，綜合運(yùn)用，靈活答題，結(jié)合具體的語境，選出正確的時(shí)態(tài)．在平時(shí)學(xué)習(xí)的過程中，對每一種時(shí)態(tài)的用法要掌握到位．

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