【題目】We________chemistry________the new term began.

A.learnt; sinceB.have learnt; whenC.have learnt; since

【答案】C

【解析】

句意：自從新學(xué)期開始，我們就學(xué)習(xí)了化學(xué).

考查現(xiàn)在完成時。learnt學(xué)習(xí)，動詞過去式或過去分詞；since自從；have learnt已經(jīng)完成，用于現(xiàn)在完成時；when當(dāng)……時。since引導(dǎo)時間狀語從句時，其前面的主句用現(xiàn)在完成時，其后的從句用一般過去時；根據(jù)空二后“the new term began.”可知句子是一般過去時；根據(jù)句意及選項(xiàng)可知，主句用現(xiàn)在完成時have/has done，since后接一般過去時態(tài)句。故選C。

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