问题
选择题
________ he still paused uncertain, he became aware that the driver was looking closely in from the street at this unusual scene.
A．While
B．As
C．Since
D．Because
答案
答案：A
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________ he still paused uncertain, he became aware that the driver was looking closely in from the street at this unusual scene.
A．While
B．As
C．Since
D．Because
答案：A