单项选择题

22（）

A．careful
B．slow
C．fast
D．appropriate

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单项选择题
21（）

A．At
B．To
C．On
D．In
单项选择题
He had gone away on business and would not return to the hotel until the next day. I should have to wait till ______ I could thank him for the present. ( )
A．afterwards
B．then before
C．then
D．then therefore
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