david promised to come round to have supper with us todaybut he___,i've been alone for half an houra.wont't b.hadn't c.hasn't d.doesn't原因是什么?

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• david promised to come round to have supper with us todaybut he___,i've been alone for half an houra.wont't b.hadn't c.hasn't d.doesn't原因是什么?
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• —You can use MSN to talk with Vivien on the Internet.— I know.But can you tell me ________?—You can use MSN to talk with Vivien on the Internet.— I know.But can you tell me ________?A.when I can use it B.what I can use itC.why can I use it D.how can I use it答案给的是A,但我想明白为什么D不是对的.— David promised to come round to havesupper with us today.— But he ____.I’ve been alone for half an hour.A.won’t B.hadn’t C.hasn’t D.doesn’t
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