I’m exhausted. I on a design day and night.You’d better have several days off after finishing it. Ot

【题目】--I’m exhausted. I ______ on a design day and night.

--You’d better have several days off after finishing it. Otherwise you might break down.

A. work B. worked

C. had worked D. have been working

【答案】D

【解析】

试题分析：考查动词时态。句意：--我很累，我整天都在忙着这个计划。-结束后你最好休息几天，否则你会垮掉的。说明做这个项目是从过去到现在说话的时候一直进行的，有可能还要继续，用现在完成进行时，A是一般过去式，表示纯粹的过去的动作，B是现在完成时，表示过去的动作对现在的影响，C是一般现在时，表示一贯的行为，所以选D。