单项选择题

The heads of the two governments met to ______ the treaty.

A. rectify
B. ratify
C. certify
D. verify
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单项选择题
The storm sweeping over SW China is sure to lead to ______ of vegetables in the following days.
A. validity
B. variety
C. scarcity
D. rarity
单项选择题
It was he in ______ we had the greatest faith.
A. who
B. whose
C. whom
D. that
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