问题
选择题
| The effect that the medicine _____ on him _____ found out. |
A. have; has B. has; have C. has; is D. had; has been |
答案
答案：D
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| The effect that the medicine _____ on him _____ found out. |
A. have; has B. has; have C. has; is D. had; has been |
答案：D