Did you see him ________ the room just now?A.leaveB.leftC.leavesD.to leave
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A解析see sb．do sth．是宾语补足语结构，do是不带to的不定式．其他感官动词hear, feel, watch, notice, observe, listen to, look at和使役动词let, make, have的复合宾语中，不定式之前的to也都须省去．又如：I heard her say so．我听见她是这么说的．在help的复合宾语中，不定式可带to也可以不带to，例如：He often helps me(to)do my lessons．他经常帮我做功课．