-Tom,you look tired

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-Tom,you look tired
-Hi,Tom,you look tired
-yes,i'm too tired.i ( ) a report all night long.
A am preparing
B prepared
C have been prepared
D had prepared
答案C为什么用现在完成时?

题目中tom回答：我准备了整夜的report,强调的是过去发生的并且是持续发生的.所以才很累.这是从对话逻辑可以得出的答案.准备report的事情发生在过去,并且已经完成.并且现在完成时可以表示时间段的持续动作.
a,将要准备（be doing）
b,做过（时间点,题目是强调持续整夜的准备）
d,过去完成时（简单理解为过去的过去,也可表示持续动作,题目中用的是i am,说明是现在的过去）

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