单项选择题


A．knowing
B．entering
C．studying
D．building
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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
单项选择题
—It is a long time ______ I saw you last.—Yes, and what a pity it is since it will be a long time ______ we see each other again.
A．before; since
B．since; before
C．when; when
D．since; when
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