Climbing Mount Tai           great skills and           not without risk.
A．requires; isB．required; wasC．required; areD．required; were
A
本題考查時態(tài)。and連接兩個并列的謂語動詞，陳述的是客觀事實，用一般現(xiàn)在時；主語都是Climbing Mount Tai。Doing 形式作主語謂語動詞用單數(shù)。
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