单项选择题

Jean Wagner's most enduring contribution to the study of Afro-American poetry is his insistence that it ______ in a religious, as well as worldly, frame of reference.

A．is to be analyzed
B．has been analyzed
C．be analyzed
D．should have been analyzed
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单项选择题
The ______ on this apartment expires in a year's time.
A．treaty
B．lease
C．engagement
D．subsidy
单项选择题
He assured us that the house was ______ enough to last another fifty years.
A．substantial
B．steady
C．spacious
D．sophisticated
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