单项选择题

What do you think of his proposal that improvements ______ in the old type of vacuum cleaner

A．be made
B．will be made
C．would be made
D．will have to be made
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单项选择题
A．scarceB．riskyC．rareD．rigid
A．scarce
B．risky
C．rare
D．rigid
单项选择题
I don't know if the story is true, but I'll try to ______ it.
A．verify
B．identify
C．reinforce
D．conform
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