Climbing Mount Tai           great skills and           not without risk.A.requi

Climbing Mount Tai           great skills and           not without risk.A.requi

题型:不详难度:来源:
Climbing Mount Tai           great skills and           not without risk.
A.requires; isB.required; wasC.required; areD.required; were

答案
A
解析
本题考查时态。and连接两个并列的谓语动词,陈述的是客观事实,用一般现在时;主语都是Climbing Mount Tai。Doing 形式作主语谓语动词用单数。
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