单项选择题


A．existing
B．new
C．old
D．future
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单项选择题
A．difficultyB．easyC．dependantD．vital
A．difficulty
B．easy
C．dependant
D．vital
单项选择题
A．was foundB．foundC．has foundD．had found
A．was found
B．found
C．has found
D．had found
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