-----interesting book it is to teach small children to swim!AHow anBWhat CWhat an DHow
问题描述：
-----interesting book it is to teach small children to swim!AHow anBWhat CWhat an DHow
答
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.我打错了 应该是-----interesting work it is to teach small children to swim!AHow anBWhat CWhat an DHow正确：B （work不可数，what后面没有an)