The World Health Organization has given some advice on        to protect us from being infected(感染) with H7N9.
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A
how
B
what
C
where
D
when
推荐题目
If it is quite _______to you, I will visit you next Monday.
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A
comfortable
B
convenient
C
easy
D
Convincing
He does his homework _____ he gets home. 
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A
as
B
as soon
C
soon as
D
as soon as