You had better take something to read when you go to see the doctor____ you have to wait.

A．even if

B．as if

C．in order that

D．in case

男性，患儿瘦高个，发音似女性，阴茎和睾丸小，智能稍差；怀疑为先天性睾丸发育不全综合征应进一步做下列哪项检查以获得确诊（）

A.颊粘膜X染色质检查

B.血雌激素测定

C.末梢血染色体检查

D.血睾酮测定

E.睾丸活检