单项选择题

Nobody knows the date of arrival, ______ ( )

A．doesn't he
B．does he
C．don't you
D．do they
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单项选择题
He has forgotten what ______ are involved and the time taken ______ delivery. ( )
A．formalities, in
B．procedures, for
C．formalities, for
D．procedures, in
单项选择题
It's a pleasure ( )be of help.
A．to
B．for
C．form
D．on
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