Mary is _________ a visit _________ China. A: on... at B: on... in C: on... to

Mary is _________ a visit _________ Chin A: on... atB. on... inC. on... to

在已有表中创建普通索引的命令是？ A: create index ... on... B: create uniqe index... on... C: create fulltext index... on... D: alter index... on...

Are you busy on...? A: Host B: Guest

Are you free on...? A: Host B: Guest

As arranged, we have effected insurance _____ goods_____ 110% of the invoice value ____ all risks. A: on... for..., against B: to... of..., with C: for..., for ..., with D: on... for..., for

If we feel for the writing jumps from on... sentences is clear.

原文:No matter what happens, he will go on...发生什么事,他都将一无反顾, 勇往直前。

I don’t think we should spend any more time on this question. “spend... on...” in this sentence means ______.

If the book you want is out on...果你想借阅的书籍已被借出，你可以怎么做？