问题补充：
---- Can I see the headmaster at the moment, please ?
---- Im afraid not. He out. He in 10 minutes.
A. has gone; comes
B. gone; came
C. has been; will come
D. has gone; will come back
答案：
A. has gone; comes
B. gone; came
C. has been; will come
(答案→)D. has gone; will come back
解析：根据答语的第一内容可知前一空，用现在完成时，表示校长已经出去了，而后一空则用in+一段时间，表示将来时态，故选D
