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You can see as far as the Taibai Mountains on top of the building _____ the sky is clear.

A. when
B. where
C. though
D. because
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科目:高中英语 来源:0127 模拟题 题型:单选题

You can see as far as the Taibai Mountains on top of the building _____ the sky is clear.
[     ]
A. when
B. where
C. though
D. because

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