问题描述:
Among almost seven hundred species of bamboo,some are fully grown at less than a foot high,while others can grow three feet in twenty-four hours.这句话里面两个grow,但是前面的是are grown,是被动形式吗,难道是被生长,还加了at,而后面又没有,
问题解答:
我来补答展开全文阅读