单项选择题

______ have come up with the solutions to the problem.

A．The boy student
B．The boys student
C．The boy students
D．The boys students
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单项选择题
These machines are better than______we turned out last year.
A．that
B．what
C．those
D．which
单项选择题
______I had done it, I knew I had made a mistake.
A．Direct
B．Directly
C．Moment
D．Constant
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