Six men have been trapped in a mine for seventeen hours. If they are not brought to the surface soon they may lose their lives. However, rescue operations are proving difficult. 以上摘自新概念2的一篇课文。请问老师这里prove为什么用现在进行时?证明就证明了...
这道题是否选D?非谓语也有时态变化,后边是过去式,前面是否应该为having been convin: ________that I was right, I went on with the proposal. A. After I concvinved B. After convincing C. Convincing D. Convinced
...me for salt-tolerant rice varieties was established in India to promote the salt-tolerant rice varieties Kala Rata l-24 and Bhura Rata 4-10, and salt-tolerant rice varieties BRI、BR 203-26-2、Sail and others developed in Bangladesh.”是否合适?