How many ______ known altogether?A、species of fishes areB、species of fish isC、

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问题 How many ______ known altogether?

选项 A、species of fishes are
B、species of fish is
C、specieses of fish are
D、species of fish are

答案 D

解析 species单复数形式相同,不存在specieses的形式。本句中从意思上判断应为复数,因此后面的动词应用are。而fish通常也没有复数形式变化,虽然有fishes的形式存在,但它只在强调各种不同种类的鱼时才用,如:to。 eat two fish(吃两条鱼),to catch a lot of fishes(捕到多种鱼)。
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