组卷网 > 初中英语综合库 > 单词辨析 > A > at
题型:单项选择 难度:0.65 引用次数:21 题号:19851676
—What is Paul doing ________ the river?
—Oh, he is writing ________ his parents.
A.in; toB.in; at
C.by; toD.by; at

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