【題目】Our teachers have been with us for nearly three years we came to junior high school. We should thank them for what they have done for us.

A. until B. before C. since

【答案】C

【解析】句意：自從我們來到初中，我們的老師和我們在一起將近三年了。我們應(yīng)該為他們?yōu)槲覀兯龅氖虑楸硎靖兄x。until直到…時候；before在…之前；since自從。這三個詞都可以引導(dǎo)時間狀語從句，根據(jù)句意和句中使用的時態(tài)可知應(yīng)選C，since從句中用一般過去時態(tài)，主句用現(xiàn)在完成時態(tài)。

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