20. ―My computer    start, no matter how hard I try.

―It might have crashed.

A. won't     B. shouldn't

C. mustn't    D. wouldn't

20.   A考查情態(tài)動詞。句意："我的電腦就是啟動不了，不管我怎么努力嘗試。""它可能死機了。"這里情態(tài)動詞will表示習慣性、經(jīng)常性和傾向性，意為"慣于，總是"。根據(jù)句意可知選A。

題目來源：2015全品語法快練高中英語新課標 > 訓練24 情態(tài)動詞和虛擬語氣

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