问题
选择题
单项选择。
There ______ a tree in front of the classroom last year, but there ______ now. [ ]
A. is, isn't
B. isn't, is
C. was, wasn't
D. was, isn't
答案
答案：D
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单项选择。
There ______ a tree in front of the classroom last year, but there ______ now. [ ]
A. is, isn't
B. isn't, is
C. was, wasn't
D. was, isn't
答案：D
