单项选择题

I heard Harry ______ "Good-bye" to his teacher as I passed by.

A．to say
B．said
C．say
D．saying
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单项选择题
Bob caught a bad cold as he ______ in the heavy cold rain the day before yesterday.
A．was caught
B．caught
C．was being caught
D．had been caught
单项选择题
On receiving the letter, he found the letter ______.
A．to be opened
B．opening
C．open
D．opened
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