问题补充：
---- John ,why are you so upset?
----I my cellphone all morning but it is nowhere to be found.
A. am looking for
B. have looked for
C. have been looking for
D. had looked for
答案：
A. am looking for
B. have looked for
(答案→)C. have been looking for
D. had looked for
解析：
试题分析:考查动词时态。句意：--约翰，为什么这么沮丧呢？---我找了一上午手机，可是在哪里也没找到。从句中的all morning 整个上午判断动作应该是一直持续的，所以排除B,D选项，然后从语境判断说话时候没在找手机，所以应该用现在完成进行时表示一直在找，故C为正确选项。
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