Poor speaker of English though he was at the time, he still managed to make himself ________.
B
非谓语动词的选用。过去分词作宾语补足语表示被动以及动作的完成。
A well-known example of the large scale destruction of an ecosystem through vegetation removal to accommodate tourist facilities is the case of the _______.
Bythemiddleofthe21stcentury,thevastmajorityoftheworld’spopulationwillbelivingincities_______inthecountry.
In Europe _______ are the two leading contenders for a global reservations system.
As to the various pollutions,which of the following is NOT true?