问题
选择题
Have you got any trouble ____this ___ practice?[ ]
A. to do, listening
B. doing, listening
C. doing, listen
D. do, listen
答案
答案：B
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Have you got any trouble ____this ___ practice?[ ]
A. to do, listening
B. doing, listening
C. doing, listen
D. do, listen
答案：B