单项选择题

John 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．be analyzed
C．has been analyzed
D．should have been analyzed
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单项选择题
______ no conclusive evidence exists, many experts believe that the wheel was invented only once and then diffused to the rest of the world.
A．Even
B．But
C．Although
D．So
单项选择题
Social companionship is beneficial in that ______.
A．it helps strengthen our ties with relatives
B．it enables us to eliminate our faults and mistakes
C．it makes our leisure-time activities more enjoyable
D．it draws our attention away from our worries and troubles
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