--Will the new iPhone cost a lot?

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--Will the new iPhone cost a lot?
--I _____ think so.Apple’s products are usually expensive.
A.shouldn’t B.needn’t C.would D.must
所给答案是C,怎么不能选D呢?must不是可以表推测,译为“肯定”吗?

表示行为习惯,用will/ would
因为苹果产品的价格一直居高不下,难免不这么想.如果用must 与语境不符,这里可不是推测哟,再说表推测也没有must + 行为动词的动词原形的.
请及时采纳,不懂继续问( 天天在线）
再问：表推测也没有must + 行为动词的动词原形? 表推测应该是must + 什么呢？多谢您的答复，您真是太渊博了！！！
再答：给你几个例子，注意不定时的形式 He must be a student (一般式） He must be watching TV （进行式） He must have seen the film （完成式）留意行为动词的形式

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