单项选择题

If he's alone, Juan likes to play action video games () they aren't too violent.

A.as long as
B.as long so
C.so long so
D.as long till

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单项选择题
How close adults are to their youngsters () a strong influence on the development of the children's character.

A.have
B.has
C.having
D.to have
单项选择题
There's a knock at the door. Who () be

A.must be
B.must it
C.can he
D.can it
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