2. 外语
  3. Tom______better than to ask his brother to help at such a critical moment.

Tom______better than to ask his brother to help at such a critical moment.

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问题 Tom______better than to ask his brother to help at such a critical moment.
选项 A、shall
B、has known
C、shouldn’t
D、should have known
答案A
解析 情态动词。shall用作情态动词，意为“必须，必将”。故答案为A。
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