问题
单项选择题
Do you know（）at the bus stop?
A.whom they are waiting for
B.who they are waiting
C.whom are they waiting for
D.who are they waiting
答案
参考答案：A
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Do you know（）at the bus stop?
A.whom they are waiting for
B.who they are waiting
C.whom are they waiting for
D.who are they waiting
参考答案：A