The twins are so muchthat it is difficult to tell one from the other.A. similarB. equalC.

问题补充：

The twins are so muchthat it is difficult to tell one from the other.

A. similar

B. equal

C. like

D. alike

答案：

A. similar

B. equal

C. like

(答案→)D. alike

解析：alike“相象”，而similar是“相似”之意；“相同的”在英语中常用的有三个词same，similar，alike，但用法不同。same与定冠词不可，分总用the same，或用指示代词；而similar是类似、近似，常与to连用；alike则只能作表语，表示相象。