单项选择题

Help others whenever you can （） you will earn respect from others without difficulty.

A. and
B. or
C. unless
D. but

相关考题

（）what would happen, none of them could find a way out....

单项选择题（）what would happen, none of them could find a way out.

A. Left wondering
B. Having left wondering
C. Leaving to wonder
D. Having left to wonder