从A、Ｂ、Ｃ、Ｄ四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
例：We ___ last night, but we went to the concert instead.
A. must have studied B. might study C. should have studied D. would study
答案是C。
6.After he had won the first prize, Mr. Su ____ to a restaurant to celebrate with us.
A. went B. has gone C. would go D. had gone
7. You have to get rid of smoking, ____ you may die of lung cancer.
A. and B. but C. so D. otherwise
