Although he has not gone to college, he shouldn't studying for their degrees. A.
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Although he has not gone to college, he shouldn't ________ studying for their degrees.
A. be prevented
B. be stopped
C. be kept from
D. be protected from
试题答案
C
D项的意思不合题意，A、B两个选项在用主动形式时，可以省略from, 但在被动语态中，都不能省略from.