问题：
[单选题]【2018年真题】Produce large numbers of new plants vegetatively would require large numbers of parent plants and correspondingly large tanks and floor space. A.To have producingB.To be producingC.To have been producingD.To produce
答案解析：
您可能感兴趣的问题
- Oxford When language learners arrive in Oxford, many ask where the university is, thinking that the
- 陪读妈妈——赔上青春 随着越来越多的中国孩子来新加坡求学，“陪读妈妈”已逐渐成为新加坡社会的一个特殊群体。作为中国学生出国留学的选择地，新加坡无疑具有其独特的优势：法律健全，环境优美，社会治安良好，
- 每天平均睡觉七小时最佳 成年人每天至少需要8小时睡眠才可以保持身体健康，这条真理不再适用，因为越来越多的证据表明少于8小时的睡眠可能更好。 三次大规模的研究发现，每晚睡7小时左右的人寿命最长。日本
- The auctioneer’s hammers were not the only thing falling as the spring auction season got underway i
- Clark Gable gave a comic performance in the movie It Happened One Nightand he was widely welcomed.
- People had been conscious of the problem before, but the new book made them aware of its importance.
- In the near future, starvation will be prevented by __________.
- The word “edge” underlined in Paragraph 5 means __________.
- To save the wild species from extinction, the author put the stress on __________.
- The “war on terror” should make it absolutely necessary for global security to rely on nuclear weapo