In Great Britain,cars,lorries and buses must keep to the left side of the street.They must stop and

In Great Britain,cars,lorries and buses must keep to the left side of the street.They must stop and look at the traffic lights of both sides of the street to cross it.And instead of looking left first,_____ we do in China,they look right first.
A if B as C when D just
答案是B，为什么不选C。

B 是“就像”的意思

只能选B。as引导方式状语从句，意思是“和中国一样向左看”。