______ at the door before you enter my room, please.A.Knock B.KnockingC.KnockedD
题型:不详难度:来源:
______ at the door before you enter my room, please.A.Knock | B.Knocking | C.Knocked | D.To knock |
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答案
A |
解析
考察句式结构。考生若能识别before是状语从句连接词,便可想到空格位置应该是主句部分的谓语,只有A项符合条件。祈使句考点常混在选项是非谓语动词的题中,常考点还有:祈使句,and/or sb. will…。如Study hard, and you will pass the exam. / Study hard, or you will fail the exam.句意:麻烦您进我屋之前先敲门。 |
举一反三
Rod loves clocks. However, he never manages to put them together again.A. taking apart | B. giving away | C. making up | D. turning off |
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New ways have been found to prevent the river ______.A.not to be polluted | B.against polluting | C.from polluting | D.from being polluted |
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The engine of the ship failed and the bad weather ______ the helplessness of the crew at sea.A.added to | B.devoted to | C.attended to | D.turned to |
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In our country the cold weather in the north_____ sharply _____the hot weather in the south.A.combines;with | B.relates;to | C.compares;with | D.contrasts;with |
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Mr. Black is a careful and experienfed engineer, so he is often _____ to finish some challenging tasks.A.appreciated | B.approached | C.appointed | D.agreed |
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