单项选择题

Enormous sums of money have been spent on space exploration.

A. Much
B. Large
C. Small
D. Fixed
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单项选择题
When does the next train depart
A. pull up
B. pull down
C. pull out
D. pull in
单项选择题
Not all member states abided by the principle they had agreed on previously.
A. adhered to
B. abandoned
C. applied
D. adopted
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