【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(lái)，東非國(guó)家經(jīng)歷了暴雨和大范圍洪水。

考查動(dòng)詞時(shí)態(tài)，experienced過(guò)去式；have experienced現(xiàn)在完成時(shí)；were experiencing過(guò)去進(jìn)行時(shí)；had experienced過(guò)去完成時(shí)，根據(jù)“Since last year”since+過(guò)去一個(gè)時(shí)間點(diǎn)，應(yīng)該用現(xiàn)在完成時(shí)，故選B。

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