1.where's David he()be in the playground becaus

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1.where's David he()be in the playground becaus
e he is fond of playing basketball .A will B may C can't D mustn't 请问这一题后面有事实依据,猜测就是肯定的,应该用must表达,可选项没有呀,而且答案是选了B?
2.LOOK!the man at the gate() be our teacher ,he is always standing there every norning.no,it () be him,he is having a meeting in the office now.A must,can't B must ,mustn't C can't ,can't 这一题后面也有事实依据答案是选A,和第一题有什么区别吗?
3.In competition ,as in life,you () not always win.A may B shall C must请问这一题表达的意思是客观规律呀,而且还是否定句应该用can呀,可选项时没有?
一头雾水,盼望着老师的解答.

楼主.你的情况和我当初上学的时候一模一样,喜欢问到底.这是好事.下面进入正题,给你详细的讲解吧.
第一题,其实我没看但的时候也是想的must,因为后面有实事根据支持我的观点.可惜,我却找不到那个must的选项.这里楼主是不是疑惑了啊?咦,这题是不是有问题啊?告诉你,没有问题.must表示的是100%的肯定额推测.但是选项没有,所以你只能退而求其次,选择一个概率差别不大的选项.首先根据意思就排除C D,然后A选项页不行,他说的是将要,不可能,只有可能是may,它的概率是70%左右.明白了么?
第二题,首先排除有must't 的选项.因为意思是表示禁止的意思,不对,所以不要.根据末尾的意思可以推测第二个空应该是can;t,因为他说了后面的理由.但是各一个空的填法真的很牵强.我真的不好说的.楼主不要怪我.可是根据选项的其他意思带入我们知道,shall不能选.因为这个只能用于第一人称.
第三题,这题楼主写错很正常.楼主初中的水平要理解这题确实有点困难.因为你的生活阅历和英语水平和还没有达到这题的水平.这题的意思说：在比赛中（或者是竞赛什么的）,正如生活中一样,我们不可能一直赢下去.选项C太绝对了,语气太强烈了,意思不对,所以排除.B shall主要用于第一人称 ,所以排除、当然,如果有楼主说的那个can的话也可以考虑,前提是没有其他合适的选项.如果有 may 和can 的话,还是选择may.为何?因为may的语气比较委婉.符合语境.can的语气比may强烈一些.
楼主,说了这么多,还有不明白的地方么?如果觉得答案满意的话就采纳我的答案吧.谢谢楼主好人啊.

where's david he ___be in the playground because he is fond 1.David is playing＿basketball in the playground 1.Mr Wang didn't play fotball in the playground.he ___(be)in colour ,the,father's,black,that,must,likes,he,be,your,becaus A:where are the students?B:()in the playground.Ashe's.Bthere He ____ not be in the room.I saw him on the playground just 小学英语书上He is in the playground 1.-Are David and Tony playing football on the playground? Where is Robert?He ____(play)football on the playground. There's a ( )(children) in the playground. WHERE'S JACK?I THINK HE'S STILL IN _BED,BUT HE MIGHT JUS BE "Where's John " "He is in the kitchen.He____________________