a set of keys后加is。a set of keys意為”一串鑰匙“,作主語時謂語動詞用單數形式is。不能用are。例如:A set of keys is on the desk。桌子上有一串鑰匙。
加is
set of keys 一串鑰匙;一副鑰匙;一套鑰匙
As it happens, I have a spare set of keys in my office. 碰巧我在辦公室有一套備用鑰匙。
My mom gave me a set of keys. 我媽媽給了我一串鑰匙。
A set of keys is on the desk. 有串鑰匙在桌子上。
Stranger: Excuse me, did you see a set of keys? 陌生人:你好,你看到一串鑰匙了嗎?
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