We may find that learning a foreign language does not have to be ______learning our mother tongue, but can in fact be as easy.
A．twice harder asB．a(chǎn)s twice hard asC．twice as hard asD．a(chǎn)s twice hard
C

這題考查倍數(shù)的表達(dá)，倍數(shù)+as adj as的用法，A項(xiàng)應(yīng)該是twice harder than，C、D項(xiàng)都是順序錯(cuò)了，選C。
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