Though ______, many laws of nature exist.A．not having been discoveredB．having not been discoveredC．

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• __ __ so much trouble, we failed to complete the task on time.A．FacedB．FaceC．FacingD．To face-英语
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• Whom would you rather have _____ with you?A．to goB．goneC．goingD．go-英语
• Please tell me the way you thought of ___ the garden. A．take care of B．to take care of C．taking car
• Time should be made good use of ____ our lessons well. A．learningB．learnedC．to learnD．having learne
• _____at in this way, the present situation about birds flue doesn’t seem so disappointing.A．LookingB
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• It passes through their bodies, only _____ a little thicker and sweeter.A．gettingB．to getC．gotD．hav
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• —How wise of you to come round, but why?—________that all is right. A．SeeB．To seeC．SeeingD．For seei
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• ____ nice, the food should be made by adding more sugar. A．TastingB．TasteC．TastedD．To taste-英语
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