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Try ________ at the back door if nobody ________ at the front door.

[  ]

A.knocking, hears

B.to knock, hear

C.knock, hear

D.knock, hearing

答案:A
解析:

try doing sth.意为“尝试做某事”,nobody是不定代词,作主语时,谓语动词用第三人称单数形式。


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