问题描述:
4.We have sold most of the goods, a small portion for old customers.
A. to retain B. retain
C. retaining D. retains
请教是使用哪个?请帮忙解释原因!
A. to retain B. retain
C. retaining D. retains
请教是使用哪个?请帮忙解释原因!
问题解答:
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