单选题
3.
It is clear that, ______ self-awareness is a healthy quality, overdoing it is detriments harmful.
A、
while
B、
as
C、
when
D、
since
【正确答案】
A
【答案解析】
可以用although替换。while在引导让步状语从句时，只能放在句首，意义上相当于although。
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