1.He ___ Mr.Black.He is taller.(用can't,can't be,must,must be

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1.He ___ Mr.Black.He is taller.(用can't,can't be,must,must be,don't have to,
1.He ___ Mr.Black.He is taller.(用can't,can't be,must,must be,don't have to,needn't其中的一个填空,请说明一下选这个词的理由)
2.You can _______ the teacher for help.(ask for 与 ask sb.to do应该是选一个填空吧)

1.第一个横线填can't be,这题要根据句子逻辑填,句子意思是：
他不可能是Mr.Black.因为他更高一点.
表示不可能只有can't be,而can't后面没有be的话就组不成一个句子
2.第二条横线填ask
ask sb to do和ask sb for ..都是固定词组搭配,由于句子后面有for,因此填ask

1.He ___ Mr.Black.He is taller.(用can't,can't be,must,must be can't be 和 must’t be can‘t be must’t be区别 He must be fifty,________?A.mustn't he B.can't C.must he D.m Our teacher must be in his office,A mustn't he B can't he C He must be from Africa,( )can be seen from his hat. A.it B.t He isn't at school .I think he ( )be ill.can,shall,must,has The light is on .Mr Green ____ back home.A.can't B.must be C Bob must be at home,________?A.mustn't he B.can't he C.isn't 用sb must be和can't be doing造句 I can't find Yao Fang.He must be ( ) the door. You can't see Mr Jones.He is ____ at the moment.He will be _