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—　　　do you have an Art Festival in your school? —Once a year.
#56324
A
How long
B
How often　
C
How far
D
How soon
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_________ we know, food gives us energy.
#58142
A
As
B
Like
C
For
D
Of
Keep your child off drugs,  ________ it will ________ many serious health and behavior problems.
#55386
A
or; point to
B
or; lead to
C
and; point to
D
and; lead to
As it reported, it is 100 years _____________ Tsinghua University was founded.
#56230
A
when
B
before
C
after
D
since
A: _________ do you exercise? B: I exercise every day!
#56318
A
How
B
What
C
How often
D
How much
____he is tired ,_____he doesn’t stop working.
#57064
A
Though ; /
B
But; though
C
though; but
D
/ ;/