摘要：He's trying to prepare himself as a basketball player. 他正在为成为一个篮球运动员而努力锻炼． l．情态动词must, should.ought to, have to ▲ must表示·必须 “肯定 .在表示推测意义的 “肯定 时.只能用于肯定句．如:

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