A cough is usually nothing to worry about unless it lasts for ten days ___.
A．or moreB．insteadC．a(chǎn)t mostD．only
A

題意是“咳嗽通常情況下沒什么擔(dān)心的，除非它要持續(xù)1天或者更長時(shí)間”。or more中的or表示選擇關(guān)系，不是構(gòu)成固定結(jié)構(gòu)，其后省略了days。at most最多；instead代替；only僅僅，只有。
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