问题
选择题
It's time___________music class.[ ]
A. at
B. to
C. for
答案
答案：C
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It's time___________music class.[ ]
A. at
B. to
C. for
答案：C
Passage Three
Cheap protein substitutes from milk, eggs and meat ______.
A．may be obtained from vitamin and minerals
B．are being sought by scientists
C．can be gotten from soybeans
D．can be found in iodized salt