单项选择题


A．future
B．present
C．business
D．English-speaking
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单项选择题
A．knowingB．enteringC．studyingD．building
A．knowing
B．entering
C．studying
D．building
单项选择题
I was really anxious about you. You ______ home without a word.
A．mustn't leave
B．shouldn't have left
C．couldn't have left
D．needn't leave
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