单项选择题

In 1984, President Ronald Reagan proposed that the United States ______ a launch laboratory for a new era of space exploration.

A．construct
B．constructs
C．constructed
D．will construct
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单项选择题
【C6】
A．worse
B．better
C．easier
D．harder
单项选择题
【C5】
A．joke
B．purpose
C．case
D．example
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