数词+hundred/thousand/million/billion+名词复数
hundreds/thousands/millions/billions of+名词复数
例
1. __people go swimming in summer in Dalian.
A、Thousands B、Thousand of C、Thousands of D、Thousand
2. __the students will take part in this English speech contest.
A. Two hundred of B. Two hundreds of C. Hundreds of D. Hundred of
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