单项选择题

"The car ran out of gas!"
"That ______ the cause. I filled the tank this morning."

A．mustn't be
B．must have been
C．can be
D．can't have been
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单项选择题
A good indication of ______ he followed the teacher's advice was that he failed.
A．what little
B．however little
C．how little
D．whatever little
单项选择题
You may make good grades by studying only before examinations, but you will succeed eventually only by studying hard every day.
A．in due course
B．in the long run
C．in the main
D．in the first place
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