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haveaheadache为什么中间有个a?headache

题目详情
have a headache 为什么中间有个a?headache
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答案和解析
是可数.但不用复数.
N-COUNT 可数名词头痛 If you have a headache,you have a pain in your head.
I have had a terrible headache for the last two days.两天来我一直头痛得厉害.