问题描述：
1.为何用has而不用had:Can you make sure where Lucy has
1.为何用has而不用had:
Can you make sure where Lucy has put the dictionary?
2.have taken和having taken,为何是have
Lily have taken my umbrella by mistake.
1.为何用has而不用had:
Can you make sure where Lucy has put the dictionary?
2.have taken和having taken,为何是have
Lily have taken my umbrella by mistake.
问题解答：
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