问题
选择题
— Did you look up the time of planes to Beijing?
— Yes, the earliest plane is to leave at 5:30 am.
A．likely
B．probable
C．possible
D．due
答案
答案：D
本题考查形容词的用法。be due to do意为“应该…/预期的”。所以，根据句意该题应选D。
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