16．Twenty-five countries _______ for help in the search for the missing ship these days．（　�。�
A．have askedB．was askedC．have been askedD．asked

分析 這些天已經(jīng)有25個國家被要求來幫助搜尋丟失的船只．

解答 答案：C．
根據(jù)時間狀語these days，可知使用現(xiàn)在完成時，countries 和謂語動詞ask之間是被動關(guān)系，因此使用現(xiàn)在完成時的被動語態(tài)故答案選C．

點評 能夠用于現(xiàn)在完成時中的一些時間狀語：up to now，until now，so far，in the last few years，these days，these years等，并且分清句中成分的主被動關(guān)系．

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