英语选择题,急!!!

1． None of us knew what had happened _______ they told us about it.

A. when B. until C. after D. though

2. Mrs. Smith was worried about both of her daughters, especially the ________ one.

A. young B. younger C. youngest D. oldest

3. You will catch up with the others _______ you work hard.

A. if B. until C. before D. while

4. The boys are playing football ________ the girls are singing and dancing.

A. as B. when C. before D. while

BBAD

B

B

A

D

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