单项选择题

There are nations whose lack of contact with the outside world has______ poverty.

A．fallen into
B．consisted in
C．resulted in
D．come up to

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单项选择题

We must______ that the experiment is controlled as rigidly as possible.

A．secure
B．ensure
C．assure
D．issue

单项选择题

The people at the party were worried about Susan because no one was aware______ she had gone.

A．where that
B．of where
C．the place where
D．the place

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