单项选择题

Several scientists have been sent to that forest to ______ the wildlife there.

[A] recognize
[B] search
[C] learn
[D] study

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单项选择题

—Hurry up! It's time to leave. —OK, ______.

[A] I come
[B] I'd come
[C] I came
[D] I'm coming

单项选择题

—I'd like to buy an expensive sport car. —Well, sir. We have got several models for you ______.

[A] to choose
[B] for choosing
[C] to choose from
[D] to be chosen from

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