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4.The Chinese government        to find the missing MH370 plane since it was reported to have disappeared.(  )
A.is tryingB.triedC.has been tryingD.had tried

分析 自从马航MH370被报道失踪,中国政府一直在尽力寻找它.

解答 答案是C.本题考查现在完成进行时.题干中"since从句"是现在完成时的标志,故排除A、B和D;现在完成进行时表示从过去某时开始到现在这一段时间里一直延续着的动作还在继续进行;根据语境判断,中国寻找马航MH370还在进行中,故选C.

点评 完成进行时的解题首先要理解其时态的基本用法--表示从过去某时开始到现在这一段时间里一直延续着的动作,特别关注其"在进行中"的特征;然后在语境中寻找动作的时间依据进行判断.

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