单项选择题

All the students were busy ___________ except Fred.

A． reading
B． to read
C． read
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单项选择题
You made a mistake, Tom. She said. She___________ Tom that he___________ a mistake.
A． said to... made
B． told.., had made
C． said.., had made
单项选择题
Did you see them ___________ in the river just now
A． to swim
B． swam
C． swimming
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