单项选择题

The missing boys were 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

-Are you coming to Kate's birthday party -I'm not sure．I ______go to the theater instead．

[A] must
[B] would
[C] should
[D] might

单项选择题

The conference has been held to discuss the effect of tourism ______the wildlife in the area.

[A] in
[B] on
[C] at
[D] with

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