问题
选择题
| The little boy is dirty from head to foot because he ____ in the mud all morning. |
A. has played B. is playing C. has been playing D. was playing. |
答案
答案：C
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| The little boy is dirty from head to foot because he ____ in the mud all morning. |
A. has played B. is playing C. has been playing D. was playing. |
答案：C