摘要：You should be careful the dog that doesn’t bark. A. of B. for C. on 93--What is behind the tree? --There must be a dog there. A. to sit B. sit C. sitting 94 there is something in this box. A. May be B. Maybe C. May 95The oral test makes up20% the final exam. A. on B. to C. of 96A serious accident her and she was badly hurt. A. happened to B. was happened to C. was happening

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