Before (scientists learned how to make a synthetic growth hormone, removing it painstakingly )in small mounts from the pituitary glands of human cadowers. C, scientists learned how to make a synthetic growth hormone, it had to be painstakingly removed D, learning how to make a synthetic growth hormone, scientists had to remove it painstakingly 选C.为什么D不对?是不是因为before的原因?大家赶紧给我回帖吧,快要考了.谢谢
你认为这两句, 哪句对呢/? 1) Before learning how to make a synthetic growth hormone, scientists had to remove it painstakingly in small mounts from the pituitary glands of human cadowers. 2) Before learning how to make a synthetic growth hormone, scientists have to remove it painstakingly in small mounts from the pituitary glands of human cadowers.
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发表于 2006-3-14 05:36:00
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