There seems to be no one at home -Why not()at the back door A.to try knocking B.to try to knockC.trying to knock D.try knocking

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There seems to be no one at home -Why not()at the back door A.to try knocking B.to try to knock
C.trying to knock D.try knocking

C try doing 尝试

答案选D。Why not后跟动词的原型,try doing指尝试做某事,try to do指努力做某事,这里指尝试着敲下后门。希望对楼主有帮助