单项选择题

Since all of them have left, you ______not have stayed.

[A] must
[B] need
[C] could
[D] may
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单项选择题
It is difficult to ______the importance of the decision.
[A] assess
[B] access
[C] recess
[D] possess
单项选择题
He has a(an) ______attitude about spending money.
[A] alert
[B] considerate
[C] ambitious
[D] cautious
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