I suppose they must be trying out new ideas in the lab,__________.A.don`t I B.mustn`t theyI suppose they must be trying out new ideas in the lab,__________.A.don`t I \x05\x05B.mustn`t they C.aren`t they \x05D.needn`t they为什么选D呢?求详解
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![I suppose they must be trying out new ideas in the lab,__________.A.don`t I B.mustn`t theyI suppose they must be trying out new ideas in the lab,__________.A.don`t I \x05\x05B.mustn`t they C.aren`t they \x05D.needn`t they为什么选D呢?求详解](/uploads/image/z/9704331-27-1.jpg?t=I+suppose+they+must+be+trying+out+new+ideas+in+the+lab%2C__________.A.don%60t+I+B.mustn%60t+theyI+suppose+they+must+be+trying+out+new+ideas+in+the+lab%2C__________.A.don%60t+I+%5Cx05%5Cx05B.mustn%60t+they+C.aren%60t+they+%5Cx05D.needn%60t+they%E4%B8%BA%E4%BB%80%E4%B9%88%E9%80%89D%E5%91%A2%3F%E6%B1%82%E8%AF%A6%E8%A7%A3)
I suppose they must be trying out new ideas in the lab,__________.A.don`t I B.mustn`t theyI suppose they must be trying out new ideas in the lab,__________.A.don`t I \x05\x05B.mustn`t they C.aren`t they \x05D.needn`t they为什么选D呢?求详解
I suppose they must be trying out new ideas in the lab,__________.A.don`t I B.mustn`t they
I suppose they must be trying out new ideas in the lab,__________.
A.don`t I \x05\x05B.mustn`t they C.aren`t they \x05D.needn`t they
为什么选D呢?求详解
I suppose they must be trying out new ideas in the lab,__________.A.don`t I B.mustn`t theyI suppose they must be trying out new ideas in the lab,__________.A.don`t I \x05\x05B.mustn`t they C.aren`t they \x05D.needn`t they为什么选D呢?求详解
前面是must 表示的是猜测 不是必须 因此后面用needn't 而一般mustn't表示禁止 语气强硬
答案有错误!应该选C。因为must be doing sth.是对现在正在发生的事情的肯定推测。改一下就好理解了:They are trying out new ideas in the lab, aren't they ?
C jim说得对