She added that having conversations with friends ____ not helpful at all

She added that having conversations with friends ____ not helpful at all
a.was b.was not c.were d.were not
为什么
英语人气:651 ℃时间:2019-11-25 19:36:55
优质解答
A
句中已有NOT ,故排除B D ,动名词用主语谓语动词用单数.
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