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(2014•ÎÞÎýÊÐ)---Has David finished his project yet?
---I guess not. He on it at lunchtime. Do you want me to confirm it?
A. is working B. was working C. has worked D. had worked
B ¡¾½âÎö¡¿ÊÔÌâ·ÖÎö£º¾äÒ⣺--´óÎÀ»¹Ã»ÓÐÍê³É×÷ÒµÂð?¡ªÎÒÏëûÓÐÍê³É°É£¬ËûÔÚÎ緹ʱ¼ä»¹ÔÚ¹¤×÷£¬ÄãÏëÒªÎÒ֤ʵһÏÂÂð?¸ù¾ÝI guess not. He on it at lunchtime¿ÉÖªËûÔÚÎç·¹µÄʱ¼äÕýÔÚ×ö£¬¹ÊÓùýÈ¥½øÐÐʱ¡£¹ÊÑ¡B¡£
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