While I was at a loss what to do,
Mary came to my help.She happened ___some shopping at the same shop.
A.to be doing B.doing C.to have done D.to do
D为什么不对,能翻译一下意思吗,
人气：169 ℃ 时间：2020-01-29 11:26:15
解答
happen to do sth.碰巧做某事.
be doing现在进行时表示Mary正在同一个商店买东西.
全句意为：玛丽来帮我的忙.她碰巧也在同一个商店买东西.
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