问题

t the earth’s atmosphere to protect them,astronauts can be exposed to intense radiation from the sun, ____ them at riskof cancer.

A:to leave
B:leaving
C:having left
D:left

正确答案是：

同类题型

Jin Yong is one of the greatest and oldest_______ writers. He is still ______.

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will give you some articles which you canwhen you write the report.

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