Climbing Mount Tai great skills and not without risk.A. requires; isB. required; wasC. req

发布时间：2020-08-16 22:06:45

Climbing Mount Tai      great skills and      not without risk.
A. requires; is
B. required; was
C. required; are
D. required; were

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(答案→)A. requires; is
B. required; was
C. required; are
D. required; were
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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