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．意為“嘗試做某事”，nobody是不定代詞，作主語時(shí)，謂語動(dòng)詞用第三人稱單數(shù)形式。


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