A. planted; planted B. planted; have planted
C. have planted; planted D. have planted; have planted
練習(xí)答案：
1.A. 1) yet, yet 2) already 3) yet
B. 1) since 2) since 3) since
C. 1) have been 2) has gone, Has, been, has been 3) have been, have been
2. BDACA ADBDC CDDBC ABCDB DCADC BB
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