A、could have called
B、will call
第1题
A、needn’t have gone to
B、mustn’t go
C、weren’t necessary to go
D、didn’t have to go
第2题
A、paints the house
B、had painted the house
C、have been painting the house
D、had been painting the house
第3题
A、before
B、as
C、while
D、as while
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