Both the teacher and the students________able to give the answer to the problem．In fact．the problem is not difficult．
A.is
B.aye
C.isn't
D.aren't
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B解析分析：主语是both the teacher and the students，不管是both…and…，还是both，还是both of…总是看成复数。另外，从In fact，the problem is not difficult．可以看出应该是肯定概念。(延伸)含有both的句子如果谓语出现否定结构的话，其意义是部分否定，如：Both the teacher and the students aren't able to give the answer to the problem．应该解释为“并不是老师和学生都能给出这问题的