D. I'd love to, and I'm busy.
12.Where was it _____the road accident happened yesterday?
A. when B. that C. whichD. how
13.______you choose, make sure that it is a good one.
A. What B. Wherever C. Whichever D. Which
14.He suggested the sports meet be _______because of the bad weather.
A. put away B. put up C. put down D. put off
15.I didn't manage to work out the problem _______the teacher had explained how.
A. until B. unlessC. when D. before
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