can:表示“可能,会”,多用于否定和疑问句
must:表推测时must语气很肯定,指“一定,必定”,只用于肯定句中.“must + 动词原形”表示对现在情况的推测.
因为 这个句子是肯定句
You must study hard if you want to get good grades in English .为什么要用must 不用can
You must study hard if you want to get good grades in English .为什么要用must 不用can
英语人气：764 ℃时间：2019-10-08 18:44:58
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