题目内容

______ any reply, he decided to write another letter.

A. Having received
B. Not have received
C. not receiving
D. Not having received

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____ the path that leads out of the town, you will come to a thick wood.

A. Taking
B. Take
C. To take
D. If take

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A. caused
B. causing
C. to cause
D. and caused

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按中国制土粒分级标准，可将土粒划分为（）、（）、（）、（）4个粒级。