问题
选择题
The young _____ the vital forces in our society.[ ]
a. is
b. has been
c. are
d. have been
答案
c
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The young _____ the vital forces in our society.[ ]
a. is
b. has been
c. are
d. have been
c
sinl00πt（V），则下列说法中正确的是（ ）
V