—May I speak to your manager Mr. Williams at five o’clock tonight?

—I’m sorry, Mr. Williams _____ to a conference before then.

A．will have gone

B．had gone

C．would have gone

D．has gone

用直接检眼镜检查眼底时不正确的方法有（）

A.应按一定顺序进行检查

B.必要时可散瞳

C.查左眼时左手持镜，左眼观察

D.查不同患者时，转盘位置固定

E.最好在暗室进行