11.Theirperformances(performance) are successful.

分析 他們的表演是成功的.

解答 performances 考查名詞復數(shù).根據(jù)后面的謂語are successful是復數(shù),可知主語的performance也應是復數(shù)形式,故填performances.

點評 本題考查名詞的復數(shù).做題時根據(jù)主謂一致的原則,謂語是復數(shù)所以主語也是復數(shù),從而得出正確答案.

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