—Jim, where _____ you _____ ?—I'm buying
问题:
—Jim, where _____ you _____ ? —I'm buying a pen. |
A. is; doing B. are; doing C. is; going D. are; going |
—Jim, where _____ you _____ ? —I'm buying a pen. |
A. is; doing B. are; doing C. is; going D. are; going |