题目内容
It is very kind ____ you to help me with these maths problems because it is very difficult ____ me to work them out.
A. of; for B. of; of C. for; of D. for; for
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题目内容
It is very kind ____ you to help me with these maths problems because it is very difficult ____ me to work them out.
A. of; for B. of; of C. for; of D. for; for