--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?

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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?

--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?
--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?

--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 ）

在情态动词表推测这个作用下，must是肯定语气里面肯定意味最强烈的，如果使用must表推测的话，那么说话人对所推测的事情是非常有把握的。 而would表推测时，肯定语气明显就没有must强烈，只能表示一般的推测而已。
所以，如果选择了i must think so，那么说明说话人是百分之九十地肯定新的iphone手机很贵。但是根据他后面的这句话，他只是一般性地认为凡是苹果出品的产品都很贵，...

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在情态动词表推测这个作用下，must是肯定语气里面肯定意味最强烈的，如果使用must表推测的话，那么说话人对所推测的事情是非常有把握的。 而would表推测时，肯定语气明显就没有must强烈，只能表示一般的推测而已。
所以，如果选择了i must think so，那么说明说话人是百分之九十地肯定新的iphone手机很贵。但是根据他后面的这句话，他只是一般性地认为凡是苹果出品的产品都很贵，注意那个usually，他不是那么地肯定新出的手机会很贵，所以不能选must。
不知这样解释你能理解么？

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