He left early on the ______that he had a bad toothache and had to see the dentist.

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问题 He left early on the ______that he had a bad toothache and had to see the dentist.

选项 A、prescription
B、pretext
C、knowledge
D、precondition

答案B

解析 on the pretext that 以……为托辞,on the prescription that根据……指示,on the knowledge that 得知……, on the precondition that 以……为前提。
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