问题描述：
-do you know _____ the smiths left last monday?-i am not sure.i only remember they left on a c...
-do you know _____ the smiths left last monday?
-i am not sure.i only remember they left on a cold afternoon.
A.when B.what C.whether D.how
-do you know _____ the smiths left last monday?
-i am not sure.i only remember they left on a cold afternoon.
A.when B.what C.whether D.how
问题解答：
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