问题
选择题
The doctor must have sat up all night with his patient, __ you see, he looks tired and sleepy.
A．as
B．which
C．for
D．because
答案
答案：C
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The doctor must have sat up all night with his patient, __ you see, he looks tired and sleepy.
A．as
B．which
C．for
D．because
答案：C