单项选择题

Clearly, if we ______ in the class we must communicate with our classmates.

A. participate
B. are to participate
C. will participate
D. do participate
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单项选择题
Becasuse of a long drought, the farmer was ______ about the prospect of a good yield.
A. alarmed
B. uncertain
C. unlikely
D. suspended
单项选择题
To produce a mighty book, you must choose a great ______ .
A. matter
B. topic
C. theme
D. thesis
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