问题
选择题
| _____ abstract, Calileo's theory was quite difficult to understand of his time. |
| A. Sounding B. Sounded C. To sound D. Having been sounded |
答案
答案：A
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| _____ abstract, Calileo's theory was quite difficult to understand of his time. |
| A. Sounding B. Sounded C. To sound D. Having been sounded |
答案：A