单项选择题

______, I must do another experiment.

A. Be it ever so late
B. It is ever so late
C. It be ever so late
D. So late it be ever
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单项选择题
The habit of economy one of the greatest differences between the savage and civilized men.
A. contains
B. Contributes
C. constitutes
D. continues
单项选择题
After ______ seemed an endless night, it was time for them to open the boxes of presents.
A. it
B. that
C. what
D. there
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