____ the machine, the engineers paid much attention to the noise from it.

A．Having examined

B．Being examined

C．Examining

D．Examined

关于妇科肿瘤化疗的不良反应，下列描述正确的是

A．白细胞常在用药后2～3天开始下降，停药后维持8～9天开始回升

B．口腔溃疡多发生在用药后7～10天，停药后2～3天自愈

C．甲氨蝶呤可引起皮肤炎性反应，严重时可导致剥脱性皮炎

D．腹泻超过6次/日时，应及时通知医生停药