Tom______better than to ask Dick for help.

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问题 Tom______better than to ask Dick for help.

选项 A、shall know
B、has known
C、shouldn’t know
D、should have known

答案D

解析 know betterthan to do sth=be wise enough not to do sth“懂得不该……;非常精明不至于做(某种蠢事)”。should have known better than to ask Dick for help“应懂得不该向狄克请求帮助”。
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