they are twins they don’t look the same at all.A. BecauseB. ThoughC. AsD. Since

问题补充：

they are twins, they don’t look the same at all.

A. Because

B. Though

C. As

D. Since

答案：

A. Because

(答案→)B. Though

C. As

D. Since

解析：连词辨析。A因为；B尽管；C因为；D既然；句意：尽管他们是双胞胎，但是他们看上去却一点也不像。故B正确。