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题目内容
（西北师范大学-作业）
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
(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