问题
Tom, would you please not make so loud noise Dad is sleeping. —- _________, mom.
A:/, a
B:/, an
C:an, a
D:An, an;
B:/, an
C:an, a
D:An, an;
正确答案是：
同类题型
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It is always not easy to live in a foreign country; ____ so if you can’t speak their language
I feel so nervous about the National English Speech Competition tomorrow.— .