问题
选择题
Although he has not gone to college，he shouldn't ________ studying for his degrees.
A．be prevented
B．be stopped
C．be kept from
D．be protected from
答案
答案：C
答案 C [题中A、B两个选项用主动形式时，可以省略from，但在被动语态中，都不能省略from。D项不合题意。]