When the plane arrived, some of the detectives were waiting inside the main building ________others were waiting on the airfield.
A．duringB．whereC．whichD．while
D
while 作并列連詞，表示對比或相反的情況，意為“而、卻”。句意為“當(dāng)飛機(jī)抵達(dá)時(shí),一部分偵探等在主樓里面，而另一部分則等在停機(jī)坪上�！�
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