【題目】Since last year east African countries ________ heavy rains and widespread floods.

A.experiencedB.have experiencedC.were experiencingD.had experienced

【答案】B

【解析】

句意：自去年以來，東非國家經(jīng)歷了暴雨和大范圍洪水。

考查動詞時態(tài)，experienced過去式；have experienced現(xiàn)在完成時；were experiencing過去進(jìn)行時；had experienced過去完成時，根據(jù)“Since last year”since+過去一個時間點，應(yīng)該用現(xiàn)在完成時，故選B。

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