问题
选择题
Look _____ the blackboard and listen _____ the teacher. [ ]
A. /; /
B. at; to
C. after; /
D. on; after
答案
答案：B
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Look _____ the blackboard and listen _____ the teacher. [ ]
A. /; /
B. at; to
C. after; /
D. on; after
答案：B