单项选择题

（）we have finished the course, we shall start doing more revision work.

A．For now
B．Now that
C．Ever since
D．By now

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单项选择题
Scientists now know that matter and energy are very closely related to（）

A．oneself
B．themselves
C．each other
D．one another
单项选择题
This study proves that there is no life on Mars. But（）man still（）there is.

A．a great deal... think
B．a great many... think
C．much... thinks
D．many a... thinks
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