单项选择题

In many cases, two or three hours are ______ to preview a lesson.

A. informed
B. required
C. demanded
D. inquired
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单项选择题
How long can you hold your ______
A. breathe
B. breath
C. breathing
D. breathy
单项选择题
______ him go out if he wants to.
A. Allow
B. Leave
C. Let
D. Permit
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