题目内容
As ________ magnet(磁铁)is moving, ________ original magnetic field will cut down or disappear.
[ ]
A.不填;the
B.a; the
C.a; 不填
D.the; an
答案:B
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题目内容
As ________ magnet(磁铁)is moving, ________ original magnetic field will cut down or disappear.
A.不填;the
B.a; the
C.a; 不填
D.the; an