The dean tried to retain control of the situation on campus,but his attempt was ___ by the board of

The dean tried to retain control of the situation on campus,but his attempt was ___ by the board of

题目
The dean tried to retain control of the situation on campus,but his attempt was ___ by the board of trustee.
A.approved B.frustrated C.disclosed D.justified.
答案
院长试图控制校园里的形势,但他的尝试被董事会阻挠了.
因为有but,所以前后是转折关系,A赞成,意思不对,B阻挠(√)C公开揭露D证明、辩护.
所以B
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