Try________atthebackdoorifnob

发布时间:2020-07-28 00:15:30

Try ________ at the back door if nobody ________ at the front door.A.knocking, hearsB.to knock, hearC.knock, hearD.knock, hearing

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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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