Without the earth’s atmosphere to protect them, astronauts can be exposed to intense radiation from the sun, them at risk of cancer.A．to leave B．leaving C．having left D．left 题目和参考答案——青夏教育精英家教网—

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Without the earth’s atmosphere to protect them, astronauts can be exposed to intense radiation from the sun, ____ them at risk of cancer.

A．to leave

B．leaving

C．having left

D．left

解析试题分析：考察现在分词做结果状语。现在分词做结果状语表示的是意料之中的结果，不定式to do和only连用表示意料之外的结果。句意：没有地球大气层的保护，宇航员可能就暴露在来自太阳的射线的照射之下，让他们处于癌症的危险之中。本句表示的是意料之中的结果。故B正确。
考点：考察现在分词做结果状语

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