第1题
A.before
B.once
C.until
D.though
第2题
A.though
B.something you wish
C.have not done
D.what is done
第3题
You ______ him out though you were very busy.
A.could have helped
B.must help
C.should have helped
D.ought to help
第4题
A.if
B.while
C.though
D.so
第5题
Seriously, (though), there's always (something you wish) you (have not done), but (what is done) cannot be undone.
A.though
B.something you wish
C.have not done
D.what is done
第7题
A.Once
B.Until
C.Though
D.Before
第8题
第9题
A B C D
cannot be undone.
第10题
A.could have helped
B.must help
C.should have helped
D.ought to help
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