——Yes, it’s said that 80 per cent of fish in this river ________ live long.

A.doesn’tB.don’tC.isn’tD.a(chǎn)ren’t

B

解析試題分析:根據(jù)live是原形可知,be動(dòng)詞之后不能跟原形,所以CD應(yīng)該排除;fish是“魚(yú)”,它的單復(fù)數(shù)同形,所以百分之八十的魚(yú)應(yīng)該是復(fù)數(shù),故助動(dòng)詞應(yīng)該用don’t。所以本題選B。
考點(diǎn):本題考查助動(dòng)詞。
點(diǎn)評(píng):本題的關(guān)鍵有兩個(gè):一個(gè)是live是原形;另一是fish,當(dāng)fish作“魚(yú)”講時(shí),其單復(fù)數(shù)同形,當(dāng)作“魚(yú)肉”時(shí),是不可數(shù)名詞。

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