﹣Where is Tom? ﹣He _____in his room. The light in his room is on.( ) A.mustn't be B.can be C.can't be D.must be 答案:D 【分析】﹣﹣汤姆在哪里? ﹣﹣他一定在房间里.他房间的灯亮着. 【解答】mustn't be不允许是.can be能是.can't be不可能是.must be一定是.根据The light in his room is on他房间的灯亮着可知,一定是在他房间里.用must be. 【点评】情态动词无人称和数的变化;不能单独使用,必须与其后的动词原形构如图所示,木块A在斜面B上匀速下滑时,B相对地面静止,则B受到地面的摩擦力
[ ]A.无 B.有,向左C.有,向右 D.有,方向无法确定