4. We owe many, many thanks _______ our teachers ______ their help.

解：答案应当选A；因为这句话的意思是对于老师为我们付出的许多帮助，我们感激不尽！
其中thank to sb for sth ，to后接sb作为宾语，表示对sb的感激之情，表示感激的对象；而
for后面接sth，表示感激的原因！
希望我的回答能让你满意~祝你学业进步^^

4. We owe many, many thanks __to_____ our teachers for______ their help.
to; for B. for; to C. for; with D. to; with

我们欠我们的老师太多的感谢由于他们的帮助。
所以选A

选a
to for

owe to感谢xxx
for their help为了xxx帮助

A 对于老师给与我们的帮助，我们亏欠他们太多的感谢。
owe sth to sb for sth.

A
对于老师给予的帮助,我们欠他们太多的感谢.

C

thanks for感谢