问题
选择题
The professor explained this theory so clearly that this phenomenon was easy enough ____. [ ]
A. for us to work out
B. working out
C. for working out
D. to working out
答案
答案：A
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The professor explained this theory so clearly that this phenomenon was easy enough ____. [ ]
A. for us to work out
B. working out
C. for working out
D. to working out
答案：A