They ----- having a picnic.A.don't B.aren't C.can't选哪个?

问题描述:

They _____ having a picnic.A.don't B.aren't C.can't选哪个?
1个回答 分类:综合 2014-12-13

问题解答:

我来补答
B
理由
1.“they” → 要选复数形式的
2.“having” → 要选be动词(be doing)
 
 
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