Climbing Mount Tai great skills and not ...

Climbing Mount Tai great skills and not without risk.

A．requires; is

B．required; was

C．required; are

D．required; were

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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