题目内容
（请给出正确答案）
提问人：网友陈银桑
发布时间：2022-01-07
[主观题]
Some designers have made a proposal that glass () not become the only material for the
Some designers have made a proposal that glass （) not become the only material for the
walks of modern buildings.
A.can
B.may
C.should
D.must
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