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 them apart

D. tell apart them

答案：

A. tell them from

B. tell from them

(答案→)C. tell them apart

D. tell apart them

解析：把两者区别开来，应用tell apart;把一者同另外一者区别开来用tell from,排除A、B两项。在由“动词+副词”构成的词组中，代词要放在动词之后，副词之前。