Question

Jack ________ go home ________ he cleaned the classroom.

1. A.
   doesn't; until
2. B.
   doesn't; and
3. C.
   didn't; until
4. D.
   didn't; or

Answer 1

C
解析：
句意为“杰克直到打扫完教室才回家”。“直到……才”用not... until...。又因从句为一般过去时，主句也应为过去时。故选C。