单项选择题

— Who ate all the cookies— Mary Ann ______ .

A．has
B．did
C．ate
D．had
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单项选择题
--are you trying to prove to police--Where I was last night.
A．What
B．Why
C．How
D．When
单项选择题
______ anyone call while I am away, please write down his name and address.
A．If
B．Should
C．Could
D．In case
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