题目内容

____ how to deal with the problem, he returned to the teacher for help.

A. knowing
B. don't know
C. Not knowing
D. having known

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______ any reply, he decided to write another letter.

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

____ 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

It rained heavily, ____ severe flooding in the area.

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

土壤矿物质按其来源可分为（）、（）。