________ trees have been planted in our school in the past 10 years.

[　　]

A．Thousands of
B．Two thousands
C．Thousand of
D．Two thousand of
答案：A
解析：

hundred，thousand，million前面沒有基數(shù)詞時，其后可加s，構(gòu)成“hundred(…)+of+可數(shù)名詞復數(shù)”結(jié)構(gòu)，表示“數(shù)百/千/百萬”之意．


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