15.-How impressive John's painting is!
-Actually,it was 2years after he retired _____ he started to learn drawing.( )
-Actually,it was 2years after he retired _____ he started to learn drawing.( )
A. | before | B. | since | C. | until | D. | that |
11.It was in the lab_____ was taken charge of by the Professor ____ they did the experiment.( )
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A. | that; where | B. | which; that | C. | whom; that | D. | which; where |