Do you know _____ this time yesterday? 　　 　

A. who are they waiting 　 　
B. who they are waiting for 　　 　
C. who were they waiting 　　 　
D. who they were waiting for
D
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Do you know _____ this time yesterday? 　　 　

[     ]

A. who are they waiting 　 　
B. who they are waiting for 　　 　
C. who were they waiting 　　 　
D. who they were waiting for

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