Jean Wagner’s most enduring contribution to the study of Afro-American poetry is his insistence that it（）in 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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I appreciated（）the opportunity to study abroad two years ago.
A. having been given
B. having given
C. to have been given
D. to have given
His first novel "Night" was an account of the Nazi crimes （）. through the eyes of a teenaged boy.
A. as seen
B. which saw
C. but was seen
D. and were seen
A constant supply of nutrients for dieters’ body requires （）
A. enough vitamin only
B. a variety of foods
C. a rich breakfast
D. enough food
Do help yourself to some drink, （） you
A. can’t
B. don’t
C. wouldn’t
D. won’t
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