Bill won’t make any progress __ he studies harder than before.
#58046
A
if
B
when
C
because
D
unless
推荐题目
My mother doesn’t like watching romantic films _______ they usually have happy endings.
#57717
A
after
B
because
C
though
D
while
---Look! Such heavy traffic!--- I doubt _________ or not I can get to school on time.
#56179
A
if
B
when
C
whether
D
why
