单项选择题

Having been asked to speak at the conversation, ______.

A. some notes were prepared for Dr. Smith
B. Smith prepared some notes
C. the conversation members were pleased to hear Dr. Smith
D. some notes were prepared by Dr. Smith
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The price of gold rose again, partly ______ news about the war.
A. result in
B. go with
C. because
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单项选择题
This is a very difficult operation. It is essential that you ______ for emergency.
A. are to be prepared
B. would prepare
C. be prepared

D. must be prepared
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