问题

Many years of hard work_______ his great success in the development of this new type of material.

A:due to
B:thanks to
C:contributed to
D:looked into

正确答案是：

同类题型

To improve their oral English, everyone in the class is supposed to ________ actively in these discussions.

We can’t afford to make any mistakes. To us, __________.

Thegirl’sfacelookedpale,soourclassroomteacherrequestedthatshe________tohospitalimmediately.[ ]

no one ____ me, for I can deal with it all bymyself.

The newly-built house, the walls _______ are painted light green, is really a peaceful place for us, especially after hard work.