单项选择题

The new law will come into ______ on the day it is passed.

[A] effect
[B] use
[C] service
[D] existence

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单项选择题

It takes ______ very unusual mind to undertake ______ analysis of ______ obvious.

[A] a; /; the
[B] a; the; the
[C] /; the; /
[D] /; the; the

单项选择题

Word came ______ I was wanted at the office.

[A] whether
[B] that
[C] why
[D] which

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