—Look at the boy with green hair. It's c...

—Look at the boy with green hair. It's cool!

—But I don't think students ________ to color their hair.

A. should be not allowed

B. should be allowed

C. should allow

D. shouldn't be allowed

B 【解析】试题分析：句意：——看那个绿色头发的男孩，太酷了。——但是我认为学生们不应当被允许染他们的头发。这里是情态动词的被动语态，其结构是情态动词+be+动词的过去分词。结合语境，故选B。考点：考查被动语态。

考点分析：

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