It looks ______ you are ill．You should go to see the doctor．（）

A．as

B．as though

C．as well

D．even though

答案：B

解析：考查连词．as连词"当…的时候，因为"；as though"好像，仿佛"；as well"也"；even though"即使"．根据句意：你看起来好像是病了，你应该去看医生．所以答案选B．