________theyarebrothers,theydon’tlooklikeeachotheratall...

________ they are brothers, they don’t look like each other at all. 　　

A. Because　　　 B. Though　　　　 C. When　　　　 D. As

解析：依據題意:儘管他們是兄弟，但他們彼此一點都不像。引導讓步狀語從句，應選B。