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

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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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