这个第9题,正确答案是through,但是我翻看牛津词典,on和through都有by means of的意思,请问这两者有什么区别?在这里为什么选through?
students can learn at home on a computer.如果用on,到这里就停止了
students can learn at home through a (computer or mobile) network. 如果用through,可以看出要表达的是through a network.
network是可数的,所以试题中少了一个a