摘要： exist A. [ig′zist] B. [ik′sist] C. [e′ksist] D. [′egzist]
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Though ______, many laws of nature exist.
A. not having been discovered B. having not been discovered
C. not having discovered D. having not discovered
查看习题详情和答案>>Though ______, many laws of nature exist.
A. not having been discovered B. having not been discovered
C. not having discovered D. having not discovered
查看习题详情和答案>>Though ______, many laws of nature exist.
A. not having been discovered B. having not been discovered
C. not having discovered D. having not discovered
查看习题详情和答案>>