题目内容

自然连接和等值连接的区别和联系。

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A rescue worker risked his life saving two tourists who__in the mountains for two days.

A. are trapping
B. have trapped
C. were trapping
D. had been trapped

—Good morning, Mr. lee’s office.—Good morning. I’d like to make an appointment__next Wednesday afternoon.

A. for
B. on
C. in
D. at

—Hi, I’m Peter. Are you new here? I haven’t seen you around?—Hello, Peter. I’m Bob. I just__on Monday.A. start B. have startedC.startedD. had started

A. start
B. have started
C. started
D. had started

__we don’t stop climate change, many animals and plants in the world will be gone.A. AlthoughB. WhileC. IfD. Until

Although
B. While
C. If
D. Until

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