问题补充：
--Could you tell us ?
--About two weeks.
A. how often are we going to be away
B. how often we are going to be away
C. how long are we going to be away
D. how long we are going to be away
答案：
A. how often are we going to be away
B. how often we are going to be away
C. how long are we going to be away
(答案→)D. how long we are going to be away
解析：about two weeks大约两周，故其问句的引导词用how long，又因宾语从句要用陈述句语序，故选D。
