单项选择题

Sellers in the group buying benefit by ()

A. paying less
B. selling many produdcts at once
C. bargaining with each buyer
D. selling goods at a higher price

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单项选择题

()American teachers sometimes have trouble understanding Japandse students in class because Japanese students ()

A. do not show their emotions as freely as American stydents do
B. are similar to American students in showing emotions
C. only express their emotions when permitted
D. do not know what to say

单项选择题

37()

A.sitting
B.sat
C.to sit
D.sit