摘要：43．I think is necessary us to do something to protect birds. A. this, for B. it, of C. this, of D. it, for
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I think ______ is necessary ______ us to do something to protect birds.
[ ]
A. this, for
B. it, of
C. this, of
D. it, for
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B. it, of
C. this, of
D. it, for
I think ________ is necessary ________ us to do something to protect birds．
[ ]
A．this, for
B．it, of
C．this, of
D．it, for