问题补充：
There are about two students in our grade.
A. thousand
B. thousands of
C. thousand of
D. thousands
答案：
(答案→)A. thousand
B. thousands of
C. thousand of
D. thousands
解析：句意：在我们年级有大约2000个学生。thousands of 模糊数字，数千，成千上万；2000，具体数字，不加s,of.故选A
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