问题
选择题
The uniform makes us look like a bunch of clones, especially _______ we are doing morning exercise in the playground.
A．since
B．which
C．As
D．when
答案
D
选项C应表示“一边……一边”两个动作同时进行，该处表示时间“当我们做早操时”，故选D项。
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