题目内容
1.-Could you please do some shopping for me,Mary?-Sorry,I ______ my homework.( )
| A. | do | B. | am doing | C. | have done | D. | was doing |
分析 -玛丽,你能帮我买些东西吗?
-对不起,我正在写作业.
解答 答案B
根据上文提示"你能帮我买些东西吗"即表示让玛丽现在去买些东西,判断出下句玛丽现在正在写作业,不能去,故用现在进行时时态,排除A,C,根据现在进行时构成"am/is/are+动词ing",本题主语为I,现在进行时动词be用am,故选B
点评 根据上文提问,判断下句时态,然后根据现在进行时构成,得出答案
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