Though ______, many laws of nature exist.A．not having been discoveredB．having n
题型：不详难度：来源：
Though ______, many laws of nature exist.| A．not having been discovered | B．having not been discovered | | C．not having discovered | D．having not discovered |
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答案
| A |
解析
| 连词加现在分词短语作状语；此句等于：Though the laws of nature have not been discovered |
举一反三
—You were brave enough to raise objection at the meeting.
—Well, now I regret ________ that.| A．to do | B．to be doing | | C．to have done | D．having done |
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—Oh，I forgot ________. | A．turning it off | B．turn it off | | C．to turn it off | D．having turned it off |
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In some parts of London, missing a bus means ________ for another hour. | A．waiting | B．to wait | | C．wait | D．to be waiting |
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Go on ________ the other exercise after you have finished this one.| A．to do | B．doing | | C．with | D．to be doing |
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