问题

_______sending emails, I’ve kept in touch with my American friend for many years.[ ]

A: In exchange for
B: On behalf of
C: In return for
D: By means of

正确答案是：

同类题型

Lisa, my hat is on the desk. Can you ____ it for me

The man in the corner be Mr. White. He is attending a conference in the City Hall. [ ]

I’m afraid the book I have lent youwon’t be interesting enough—___

Here __________ some pencils on the table .

At present ________ of the experiments ________done in labs after the new building has been finished.