单项选择题

If the fire alarm is sounded, all residents are requested to ______ in the courtyard.

A．converge
B．assemble
C．crowd
D．accumulate
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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
单项选择题
Though he views himself as a realist, Cetron says that his findings make him very ______ about future.
A．optimistic
B．sympathetic
C．objective
D．precautious
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