27 If nobody answers the door bell ,try ___ the back door.A to knock at b.to knock c.knocking at d.knocking 需要详细分析

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27 If nobody answers the door bell ,try ___ the back door.A to knock at b.to knock c.knocking at d.knocking 需要详细分析
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27 If nobody answers the door bell ,try ___ the back door.A to knock at b.to knock c.knocking at d.knocking 需要详细分析
27 If nobody answers the door bell ,try ___ the back door.
A to knock at b.to knock c.knocking at d.knocking 需要详细分析

27 If nobody answers the door bell ,try ___ the back door.A to knock at b.to knock c.knocking at d.knocking 需要详细分析
答案选C吧
try to do 表示"努力做某事"
try doing 表示"试着做..."

c,辞典看错,不好意思