题目内容
We could hear birds ________in my hometown in the past, _________ now we can’t.
A. to sing; and B. sing; and
C. to singing; because D. sing; but
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题目内容
We could hear birds ________in my hometown in the past, _________ now we can’t.
A. to sing; and B. sing; and
C. to singing; because D. sing; but