The two brothers look so much alike that it is difficult to .A. tell them fromB. tell from

问题补充：

The two brothers look so much alike that it is difficult to .

A. tell them from

B. tell from them

C. tell apart them

D. tell them apart

答案：

A. tell them from

B. tell from them

C. tell apart them

(答案→)D. tell them apart

解析：考查词组take apart“区分”，tell sth from sth“区分…和…”，所以AB都少宾语，另外代词要在tell apart中间，选C。句意是：两兄弟看起来很象以至于很难区分他们。