----- Our holiday cost a lot of money.----- Did it? Well, that doesn't matter______ you enjoyed yourselves.
A. as long as
B. unless
C. as soon as
D. though
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---- Coach, can I continue with the training?---- Sorry, you can't _____ you haven't recovered from the knee injury.
A. until
B. before
C. as
D. unless
Jack wasn't saying anything, but the teacher smiled at him _____ he had done something very clever.
A. as if
B. in case
C. while
D. though
Great changes have taken place in our school ______ you left.
A. since
B. until
C. before
D. when
______ we have enough evidence, we can't win the case.
A. Once
B. Aa long as
C. Unless
D. Since