单项选择题

Ms. Gerta was asked at short ______ to give a speech at the conference.

A．sentence
B．signal
C．notice
D．announcement
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单项选择题
______ the software program still contains some bugs, the developers think it will be a commercial success.
A．Furthermore
B．In spite of
C．However
D．Although
单项选择题
You should return the book to the store and ______ for a full refund of the purchase price.
A．ask
B．asked
C．asking
D．to ask
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