单项选择题

_______ if I had arrived yesterday without letting you know beforehand

A．Would you be surprised
B．were you surprised
C．Had you been surprised
D．Would you have been surprised
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单项选择题
When our university laboratory bought this microscope we were given a one year's _______.
A．reservation
B．security
C．proof
D．guarantee
单项选择题
The energy gained from the sun can then be used during the hight to enable the necessary chemi-cal reactions to _______ in his body.
A．conduct
B．proceed
C．progress
D．practice
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