单项选择题

During their fist teacher training year, the students often visited local schools for the （）of lessons.

A. observation
B. investigation
C. inspection
D. examination

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单项选择题
Do you have any （）about what living beings on other planets would be like

A. ideal
B. comprehension
C. notion
D. intelligence
单项选择题
Mary once （）with another musician to compose a piece of pop music.

A. merged
B. collaborated
C. coincided
D. constituted
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