单项选择题

In his ______ to further his knowledge of the universe, man has now begun to explore space.

A．attempt
B．expedition
C．trial
D．chase
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A．investigationB．analysisC．negotiationD．sample
A．investigation
B．analysis
C．negotiation
D．sample
单项选择题
A．soldB．is soldC．sellsD．sells to be
A．sold
B．is sold
C．sells
D．sells to be
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