问题
选择题
He picked up an envelope ____50 dollars in it.
A．containing
B．contained
C．which contains
D．which was contained
答案
答案：A
考查现在分词做定语，envelope和contain是主动关系，句意是：他捡起一个里面有50美元的信封。C项应该是过去时，选A。
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