问题
选择题
When the plane arrived, some of the detectives were waiting inside the main building ________others were waiting on the airfield.
A．during
B．where
C．which
D．while
答案
答案：D
while 作并列连词，表示对比或相反的情况，意为“而、却”。句意为“当飞机抵达时,一部分侦探等在主楼里面，而另一部分则等在停机坪上。”