单项选择题

A．Therefore
B．Unfortunately
C．In a word
D．In comparison
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单项选择题
A．problemB．difficultyC．troubleD．matter
A．problem
B．difficulty
C．trouble
D．matter
单项选择题
A．formerB．returnedC．reversedD．regular
A．former
B．returned
C．reversed
D．regular
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