Tom _______ have kept his promise. I wonder why he changed his idea. 单选题 (10 分) A. must B. should C. need

Tom _______ have kept his promise. I wonder why he changed his idea.
单选题 (10 分)
A.
must

B.
should

C.
need

出自：国家开放大学理工英语3（贵州）

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