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21£®How did you find your visit to the botanical garden, Tom?
A. Oh, wonderful, indeed. B. By taking a number 6 bus
C.I went there alone D.A classmate of mine show me the way
22._____your essay carefully before you hand it in ,some mistakes can surely be avoided, I think.
A. Having checked B. Check
C. As long as you check, D. While checking
21£®How did you find your visit to the botanical garden, Tom?
A. Oh, wonderful, indeed. B. By taking a number 6 bus
C.I went there alone D.A classmate of mine show me the way
22._____your essay carefully before you hand it in ,some mistakes can surely be avoided, I think.
A. Having checked B. Check
C. As long as you check, D. While checking