问题

In communication, a smile is usually ______ strong sign of a friendly and ______ open attitude.
A:the, /
B:a, an
C:a, /
D:the, an
B:a, an
C:a, /
D:the, an
正确答案是:
同类题型
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What does Ann often have _____ breakfast? — She often has some bread and milk. [ ]