Frankly, I really doubt he will pass the driving test, for he missed much training.
A. that
B. whether
C. which
D. what
网友回答
A. that
(答案→)B. whether
C. which
D. what
解析：考查doubt的用法;在否定句和疑问句中，doubt后面接that引导的宾语从句。在肯定句中，doubt后面一般接whether或if引导的宾语从句。句意：老实说，我真的怀疑他是否会通过驾驶测试，因为他缺乏很多训练。选B。