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Space and oceans are the new world which scientists (try) ______ to explore.

【参考答案】

are trying
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A．It costs 10 dollars.B．We have some cheaper ones.C．I want to buy it.D．We’d better look over it.
A．It costs 10 dollars.
B．We have some cheaper ones.
C．I want to buy it.
D．We’d better look over it.
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