问题
选择题
— ____ he be at home now ?
— No . he ____ not . He ____ be in his office . He often goes home from work at almost twelve .
A．Can ; can ; must
B．Must ; need ; can
C．May ; must ; must
D．May ; need ; must
答案
A。
B不用疑问句；C、D两项第一空不用于疑问句表推断。