单项选择题

Tom looks so pale today. He （） ill.

A. must be    
B. had to be 
C. should be 
D. shall be

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Even if you are an experienced teacher, you sometimes（） make some mistakes.

A. can
B. must
C. should
D. will
单项选择题
In this park, sparrows often fly down from trees to eat from visitors' hands. They are used to （）in this way.

A. be fed
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C. having fed
D. being fed
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