-----interesting book it is to teach small children to swim!AHow anBWhat CWhat an DHow

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-----interesting book it is to teach small children to swim!AHow anBWhat CWhat an DHow
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-----interesting book it is to teach small children to swim!AHow anBWhat CWhat an DHow
-----interesting book it is to teach small children to swim!AHow anBWhat CWhat an DHow

-----interesting book it is to teach small children to swim!AHow anBWhat CWhat an DHow
正确:C
记住:what突出名词,how突出形容词/副词/动词.book为可数名词单数,interesting以元音音素开头,故what后加an.