問題詳情
1. This is _______ P； not _____ R.
(A) a； a
(B) a； an
(C) an； a
(D) an； an
(A) a； a
(B) a； an
(C) an； a
(D) an； an
參考答案
答案：B
難度：計算中-1
書單：沒有書單，新增
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