No sooner _______ the competition _______ _______ an unexpected accident happened.
A.did … begin; than | B.had … begun; when |
C.did … begin; when | D.had … begun; than |
推荐套卷
No sooner _______ the competition _______ _______ an unexpected accident happened.
A.did … begin; than | B.had … begun; when |
C.did … begin; when | D.had … begun; than |