单项选择题

21（）

A．used
B．using
C．to use
D．use

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单项选择题

The author regards George Mason’s personal contribution to American law as （）

A．not comparable to that of Adams or Madison
B．greater than that of either Adams or Madison
C．of the same importance as that of Adams and Madison
D．second in importance only to that of Adams and Madison

单项选择题

He had gone away on business and would not return to the hotel until the next day. I should have to wait till （） I could thank him for the present.

A. afterwards
B. then before
C. then
D. then therefore