问题

I think that studying in pairs or groups is necessary____you want to learn from each other in class.

A:though
B:until
C:unless
D:if;

正确答案是：

同类题型

They became good friends during the war, and since then their lifelong friendship has______ tests of life and death.

In my opinion，your compositionis not as interesting as his but yours isin writing

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