单项选择题

The missing boy was last seen ______near the river.

A．playing
B．to be playing
C．play
D．to play
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单项选择题
—Have you ______been to our town before —No, it's the first time I ______here.
A．even; come
B．even; have come
C．ever; come
D．ever; have come
单项选择题
Paul doesn't have to be made______. He always works hard.
A．learn
B．to learn
C．learned
D．learning
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