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We must study hard, because we shouldn’t _______ our parents

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We must study hard, because we shouldn’t _______ our parents _______ .
A.make; down B.let; up C.help; happy D.let; down
We must study hard, because we shouldn’t _______ our parents
D

本题考查的动词固定词组搭配let···down表示让某人失望的意思,故选答案为D