单项选择题

21（）

A．At
B．To
C．On
D．In

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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
单项选择题
No sooner ______ the news than they rushed out into the street. ( )
A．they heard
B．they had hear
C．did they hear
D．had they heard
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