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1021.The old lady's hand shook frequently. She explained to her doctor _____ this shaking had begun half a year before, and ____，only because of this, she had been forced to give up her job.
A.when；how
B.how；when
C.how；how
D.why；why
1022.The shopkeeper did not want to sell for ___ he thought was not enough.
A.where
B.how
C.what
D.which
