问题
选择题
When _______ to our school, the new study methods are popular with all the students.
A．to introduce
B．introduced
C．introducing
D．to be introduced
答案
B
非谓语动词,过去分词表被动。
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When _______ to our school, the new study methods are popular with all the students.
A．to introduce
B．introduced
C．introducing
D．to be introduced
B
非谓语动词,过去分词表被动。