he wanted to visit Latin America-----.A.firstB.at first

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he wanted to visit Latin America-----.A.firstB.at first

he wanted to visit Latin America-----.A.firstB.at first
he wanted to visit Latin America-----.
A.first
B.at first

he wanted to visit Latin America-----.A.firstB.at first
A
首先
at first是预示后面有变化的,我们不知道有什么变化就要选A

A
从语法和理解上说B是错误的

A