问题
选择题
We are at the library . Please ___ quiet .
A．do
B．be
C．can
D．are
答案
答案：B
quiet是形容词，要和系动词连用，且Please ___ quiet是祈使句，要用动词原形开头。所以选B。
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We are at the library . Please ___ quiet .
A．do
B．be
C．can
D．are
答案：B
quiet是形容词，要和系动词连用，且Please ___ quiet是祈使句，要用动词原形开头。所以选B。