______ over and over again, but he still couldn’t understand.A．Having explainedB
题型：不详难度：来源：
______ over and over again, but he still couldn’t understand.| A．Having explained | B．Having been explained | | C．Explaining | D．It had been explained |
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答案
| D |
解析
| 本题考查时态。本题根据but he still couldn’t understand为过去时，故从句用过去完成时。句意：它解释了一遍又一遍，但他仍无法理解。 |
举一反三
There is ______ what the weather will be like.| A．not knowing | B．no knowing | C．not known | D．no known |
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---- One more question, Sir?
----Wait a minute. I ____ your questions for more than 30 minutes without a break.
Where is my cup?| A．have been answering | B．have answered | | C．had answered | D．answered |
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The plant is dead. I ______it more water.| A．will give | B．would have been | C．must give | D．should have given |
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When I arrived at the station, I found the train _________ for passengers. | A．waited | B．had been waiting | C．would wait | D．wait |
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Have you seen my dog? I _________ for it and still haven’t found it. | A．looked | B．was looking | C．have been looking | D．had been looking |
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