______ how others react to the book you have just read creates an added pleasure. A. Hearing B. Hear C. Having heard D. To be hearing答案是A,C的完成式表示动作发生在先,和D的进行式表示与主句动作同时进...
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useful lessons for agriculture and food policymakers worldwide." says the
bank's Juergen Voegele.这句话的句子成分是怎样的?while究竟是干啥的?如果说while引导了一个省略状语从句,那主句又在哪里?