题目

Our parents won't allow us _____ in the river alone.A. swimB. to swimC. swimmingD. swam 答案：【答案】B【解析】句意：我们的父母不允许我们单独去河里游泳。A. swim动词原形；B. to swim动词不定式；C. swimming分词形式；D. swam过去式。Allow sb to do sth允许某人做某事。故答案选B。以25m/s的速度行驶的列车，紧急制动后，匀减速地滑行，经10s停止，则在制运过程中列车的行驶路程为________m．