You______see the doctor if that back ache persists.

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问题 You______see the doctor if that back ache persists.

选项 A、better
B、better have
C、have better
D、had better

答案D

解析 Had better最好……,选项D是正确的。句子大意:如果背还在持续地痛,你最好去看医生。
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