单项选择题

How long ______ since I bumped into you and your sister at McDonald

A．is it
B．was it
C．had it been
D．has it been
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单项选择题
Please write your name in the ______ space at the top of the page.
A．empty
B．vacant
C．blank
D．free
单项选择题
When we left, he again expressed his ______ of our timely help.
A．gratefulness
B．appreciation
C．expectation
D．anticipation
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