问题

Try your best to help the people when they are in trouble, _______you will feel pleased and happy
A:unless
B:or
C:and
D:But
B:or
C:and
D:But
正确答案是:
同类题型
I reminded you not to forget to turn off the lightswhen you left the classroom.—— ________________.
l diseases are believed to______ the lives of many children annually, malaria _______
My father is_____ to play tennis every Sunday.[ ]
It’s difficult to calculateits price would be if the museum wanted to sell the ancient vase.