You may borrow this book ­­­ ________ you promise to give it back. 
#80283
A
in case
B
so long as
C
as if
D
even if
推荐题目
___ is the most useful invention?
#32091
A
Do you think which of these
B
Which of these you know
C
Which of these do you know
D
You know which of these