单项选择题

Having been ill in bed for nearly a month, he had a hard time ______ the exam.

A．pass
B．to pass
C．passed
D．passing
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单项选择题
I invited Tom and Ann to dinner, but ______ of them came.
A．neither
B．both
C．either
D．none
单项选择题
There are only ______ days left before summer holidays.
A．a little
B．little
C．a few
D．many
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