Jason is a great tour guide

Jason is a great tour guide because he is not only ready to help _____ also very knowledgeable.

此題答案為4 but ((not only ... but also .... 不僅...而且....))

1.或者

2.所以

3.而且

翻譯：Jason是一個很棒的導遊，因為他不僅很樂意幫忙((幫忙))而且還很有知識。