People seldom trust him since he usually fails to______his promises.

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问题 People seldom trust him since he usually fails to______his promises.

选项 A、keep to
B、keep on
C、keep off
D、keep up

答案A

解析本题需弄清以keep为中心的四个短语动词的意思。A项keep to意为"遵守，坚持",B项keep on意为"继续…"，C项keep off意为"让开，挡开"，D项keep up意为"保持，继续"。根据题意，A为正确答案。

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GCT工程硕士（英语）

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