一、Some facts and skills are learned by_________activities.
A.taking
B.taking advantage of
C.keeping up with
D.giving rise to
D 不明白是怎么回事,如果可以的话求这句翻译
二、Other adverbs of frequent are continually.
frequent不是形容词吗?它怎么能在介词of后使用?
三、The area of that city is about________that of this one.
A.charged
B.to be charged
C.being charged
D.to have charged
我想知道charge在这里是什么意思?还有为什么选D?