基本信息
连词及从句：
1.---Close the windows,________ youll catch cold.
---OK, _______youd better not smoke.
A. and, but B. or, therefore C. and, however D. or, but
2. --What was the party like? --Wonderful. Its years _______I enjoyed myself so much.
A. after B. when C. since D. before
3._______ you have made a promise, you should carry it out,
A. Until B. Once C. For D. Whil
