11.Theirperformances(performance) are successful.

分析 他們的表演是成功的.

解答 performances 考查名詞復(fù)數(shù).根據(jù)后面的謂語(yǔ)are successful是復(fù)數(shù),可知主語(yǔ)的performance也應(yīng)是復(fù)數(shù)形式,故填performances.

點(diǎn)評(píng) 本題考查名詞的復(fù)數(shù).做題時(shí)根據(jù)主謂一致的原則,謂語(yǔ)是復(fù)數(shù)所以主語(yǔ)也是復(fù)數(shù),從而得出正確答案.

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