问题描述：
visit的名词形式可数吗?
或者直接告诉我这题选什么?
I haven't seen Mr.black and his wife for a long time.
------Blacks are on -------visit to Africa.
A./;a B.A;the CThe;a DThe;/
或者直接告诉我这题选什么?
I haven't seen Mr.black and his wife for a long time.
------Blacks are on -------visit to Africa.
A./;a B.A;the CThe;a DThe;/
问题解答：
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