单项选择题

You are too rigid: you must learn to change your plans when the situation it.

A. calls on
B. calls for
C. calls forth
D. calls in
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单项选择题
If your expenses ______your income, you will be in debt.
A. surpass
B. exceed
C. survive
D. pass
单项选择题
John's ideas about how to solve the problem were so cogent that I had to agree with him.
A. chronic
B. cavernous
C. convincing
D. choral
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