问题

They ______ going to school on foot before they went to high school.

A:if
B:because
C:because of
D:so;

正确答案是：

同类题型

______ helped the poor catfind its home?— My best friend, Mary.

We had a really bad time about six months ago but now things are ____.

in the lab, ________ was taken charge of by Professor Curie, _______ theydid the experiment

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33Once ____you may feel uncomfortable