单项选择题

Because Max had lung cancer, he stopped ______ .

A．to smoke
B．smoke
C．smoked
D．smoking
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单项选择题
My roommate wrote that letter ______ me. I couldn't do it because I sprained my wrist while playing volleyball.
A．to
B．from
C．for
D．by
单项选择题
You ______ all morning, but you ______ three letters!
A．have been typing, have only done
B．were typing, only did
C．had been typing, have only done
D．have typed, have only done
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