问题补充：
The room a bit untidy now. Why don’t you tidy it up?
A. is
B. are
C. was
D. were
答案：
(答案→)A. is
B. are
C. was
D. were
解析：本题主要考查时态,根据语境该句应用一般现在时，排除C、D，主语是单数，谓语用第三人称单数形式，故选A
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