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SECTION A
Directions：Beneath each of the following sentences there are four choices maked with A,B,Cand D.Choose the one that best completes the sentence.
21. Your work is well done; there is some room for improvement in it, ______.
A. as B. although C. but D. though
22. How long do you suppose it is ____ he arrived there?
A. when B. before C. after D. since
23. Sleeping in bed, I could hear the rain _____ against the window.
A. hitting B. striking C. beating D. dropping
Directions：Beneath each of the following sentences there are four choices maked with A,B,Cand D.Choose the one that best completes the sentence.
21. Your work is well done; there is some room for improvement in it, ______.
A. as B. although C. but D. though
22. How long do you suppose it is ____ he arrived there?
A. when B. before C. after D. since
23. Sleeping in bed, I could hear the rain _____ against the window.
A. hitting B. striking C. beating D. dropping
