问题补充：
A number of students reading in the classroom now.
A. is
B. was
C. are
D. were
答案：
A. is
B. was
(答案→)C. are
D. were
解析：C 考查a number of和the number of的区别，前者意为“许多”，与many等同；后者意为“......的数量”，谓语用单数。“现在有很多学生在教室里读书。”故选C。
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