单选题：________ regular exercise is very important, it's never a g..

—It's a long time________I saw you last.—Yes,and what a pity it is now that it will be a long time________we see each other again.[ ]A. before; sinceB. since; whenC. since; beforeD. when; before

Why not get some work experience first go straight on to university?[ ]A. other thanB. rather than C. more thanD. less than

One more week, _____ we will accomplish the task. [ ]A. or B. so that C. and D. if

______ I always felt I would pass the exam, I never thought I would get an A.[ ]A. WhileB. OnceC. IfD. Until

Shut the window, _____ it'll get too cold here. [ ]A. so B. yet C. but D. otherwise