问题
选择题
Although I failed several times, my father encouraged me ____ another try. [ ]
A. having
B. to have
C. had
D. have had
答案
答案：B
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Although I failed several times, my father encouraged me ____ another try. [ ]
A. having
B. to have
C. had
D. have had
答案：B
+OH
==CO
+H2O
+Ba2+ ="=" BaSO4↓