22[单选题,1.3分] It is ______ for adults to forget how long and hard and dull school is. A.habitual B.customary C.natural D.conventional

22[单选题,1.3分] It is ______ for adults to forget how long and hard and dull school is.
A.habitual
B.customary
C.natural
D.conventional

出自：河南大学-本科英语

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