The two girls are so alike that strangers find ____ difficult to tell one from the other.
A．itB．themC．herD．that
A
那兩個女孩太像了，很難分清她們誰是誰.
it 可以指代物也可以作為形式主語指代前面提到的事物或句子. it是形式賓語.選A
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