问题
选择题
When my parrot is hungry, he _____ the cage_____ his beak. [ ]
A. knocks on…in
B. knocks at…of
C. knocks on…with
D. knocks at…on
答案
答案：C
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When my parrot is hungry, he _____ the cage_____ his beak. [ ]
A. knocks on…in
B. knocks at…of
C. knocks on…with
D. knocks at…on
答案：C