介词填空 There are two blackboards ___every classroom .One is ____us .The other is ___us

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介词填空 There are two blackboards ___every classroom .One is ____us .The other is ___us

There are two blackboards in (在.里面) every classrom.One is in front of (在.前面),the other one is behind (在.后面) us.

in , for , for

in
in front of
behind