问题描述：
I think it was last December.Or I think it is last December哪个对?
When __ Mr.Harris __ the town for Sydney?
I think it __ last December.
A.did,leave; was B.did,leave; is
When __ Mr.Harris __ the town for Sydney?
I think it __ last December.
A.did,leave; was B.did,leave; is
问题解答：
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