由had和yesterday得知体现一般过去时,故借助组动词did
David didn't have a cold yesterday.(did已经体现一般过去时,故had还原为原形have)
David had a cold yesterday.改成否定句.david()()a cold yesterday.
David had a cold yesterday.改成否定句.david()()a cold yesterday.
英语人气:419 ℃时间:2019-09-13 19:24:35
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