单项选择题

Whenever he writes to his parents, he______a check with his letter.

A. includes
B. contains
C. inserts
D. encloses
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单项选择题
They were digging day and night to find some______of the Viking Period.
A. tracks
B. tracts
C. traces
D. traits
单项选择题
When she graduated from the best high school in that city, she got her______.
A. diplomat
B. certificate
C. degree
D. identity
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