问题描述：
1题英语选择题.I couldn't follow what he said ______ A.f
1题英语选择题.I couldn't follow what he said ______
A.for the first
B.at first
C.the first
D.at the first
1题英语选择题.I couldn't follow what he said ______
A.for the first
B.at first
C.the first
D.at the first
问题解答：
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