____ be careful when crossing the street!A.MustB.ShouldC.Ought toD.Do
题型:不详难度:来源:
____ be careful when crossing the street!A.Must | B.Should | C.Ought to | D.Do |
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答案
D |
解析
加强祈使句的语气,不管动词是系动词还是行为动词,都在动词前加do。 |
举一反三
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