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Where is Tom? He hasn't come to school today. I think he ___

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Where is Tom? He hasn't come to school today. I think he ____be ill.为什么选D,考点是什么
A has to B had better C can D must
Where is Tom? He hasn't come to school today. I think he ___
题目的意思是:“汤姆在哪儿?他今天没去学校,我认为他一定是生病了.”
A中has to是“不得不” 的意思,若选A,意思变为“她不得不生病”,就不符合语境
B中had better 是“最好 ”的意思,意思变为“他最好生病”,不符合
C中can是“可能、能够” 的意思,而can 在表示“ 可能 ”的表推测的意思时只用于否定,即can not,译为“不可能,一定不是” ,与must相对