单项选择题

Then, the currency rose 2.1 per cent against the dollar on the first day, ______ it was allowed to trade within a set range.

A. after that

B. and that
C. after it
D. after which

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If some one need help ______ meet a trouble ______ seems not to be got over easily, the other must not leave until overcome it.

A. Who; which
B. Whom; with which
C. When; which

D. When; with which

单项选择题

Mr. Wolf was a member of the group （） visited us.

A. which
B. that
C. whom
D. to whom

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