单选题_____AWhenBSinceCThoughDUnless
单选题
_____
A
When
B
Since
C
Though
D
Unless
参考解析
解析：
when当……时候；since既然；though尽管，虽然；unless除非。根据上下文，该句和下句“when we are down-to-earth”是并列的关系，也应该由when来引导，因此A正确。
when当……时候；since既然；though尽管，虽然；unless除非。根据上下文，该句和下句“when we are down-to-earth”是并列的关系，也应该由when来引导，因此A正确。
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