An awful accident _____,however,occur the other day.A.do B.did C.has to D.had to原因

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Anawfulaccident_____,however,occurtheotherday.A.doB.didC.hastoD.hadto原因Anawfulaccident_____,however,

An awful accident _____,however,occur the other day.A.do B.did C.has to D.had to原因
An awful accident _____,however,occur the other day.
A.do B.did C.has to D.had to
原因

An awful accident _____,however,occur the other day.A.do B.did C.has to D.had to原因
把插入however语去掉就明显了:An awful accident did occur the other day.
did 在这里只是表示强调“确实发生”,后面接动词原形.the other day 说明要用do的过去时

B

上面的人说的很对