单项选择题

The two astronauts______ someday hope it is to fly the craft into earth orbit were fight testing.

A．that
B．whom
C．whose
D．who
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单项选择题
A．substituteB．replacementC．changeD．diversity
A．substitute
B．replacement
C．change
D．diversity
单项选择题
A．awayB．withC．outD．in
A．away
B．with
C．out
D．in
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