Never stand up ________ you are asked to.
#58222
A
if
B
since
C
unless
D
when
推荐题目
You won’t feel happy at school ______ you get on well with your classmates.
#58383
A
though
B
when
C
unless
D
because
I want to buy some postcards in the shop, _______ I don’t have enough money.
#57478
A
and
B
but
C
or
D
so