They asked the teacher .A. when will they have the examB. when they would have the examC.

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A. when will they have the exam
(答案→)B. when they would have the exam
C. when they have the exam
D. when would they have the exam
解析：考查宾语从句。任何一个宾语从句都使用陈述语序，故AD错误。根据asked说明在过去问将来，故使用过去将来时。句意：：他们问老师，他们什么时候讲考试。根据句意说明B正确。