问题描述：
By 16:30,was almost closing time,nearly all the paintings had been
By 16:30,_______ was almost closing time,nearly all the paintings had been sold.
A.whcih B.when C,what D.that
为什么不可以是C?
By 16:30,_______ was almost closing time,nearly all the paintings had been sold.
A.whcih B.when C,what D.that
为什么不可以是C?
问题解答：
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