问题

There happened to be nobody under the wall when it fell down, ____ ?
A:wasn't there
B:was there
C:didn't there
D:did there
B:was there
C:didn't there
D:did there
正确答案是:
同类题型
下列各句加点词的用法与例句不同的一项是( ) 例句:奚以之九万里而南为
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