问题补充：
There are over twenty visitors visiting the park.
A. thousand
B. thousands
C. thousand of
D. thousands of
答案：
(答案→)A. thousand
B. thousands
C. thousand of
D. thousands of
解析：twenty 后接thousand 不需要加S，故选A
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时间：2020-07-25 20:25:45
There are over twenty visitors visiting the park.
A. thousand
B. thousands
C. thousand of
D. thousands of
(答案→)A. thousand
B. thousands
C. thousand of
D. thousands of
解析：twenty 后接thousand 不需要加S，故选A
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