--Hello, Sandy. This is Jack. What are you doing?
---I’m watching a match. It started at 7:00 p.m. and _____ on for another an hour.
A．has beenB．wasC．had beenD．will be
D

試題分析：句意：你好，仙蒂，我是杰克，你在做什么？我正在看比賽。下午7點開始的，還需要一個小時。句中有for another an hour.表示一段時間，句中謂語動詞要有延續(xù)性，be on表示上演，可以延續(xù)，故選D
點評：非延續(xù)性動詞向延續(xù)性動詞的轉(zhuǎn)變熟記一下幾個：
leave --- be away,  borrow --- keep,   buy --- have,  begin/start --- be on,      die --- be dead, leave --- be away from, fall asleep --- be asleep
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