单项选择题

We should always () our opinion () facts.

A. base ... in
B. base ... on
C. basis ... in
D. basis ...on

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单项选择题

The game will take place ()June 2nd.

A. on
B. at
C. in
D. during

单项选择题

So far there is no proof () spaceships from other planets do exist．

A．which
B．that
C．how
D．what

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