单项选择题

Conversation 1

A. By calling.
B. By downloading online.
C. By email.
D. By going to the classes on weekdays.
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单项选择题
The origin of language is
A. clearly explained in this passage
B. a matter that can not be or has not been explained or understood
C. a question that was difficult to answer
D. a problem already solved
单项选择题
The old man has two daughters, ______ are teachers.
A. both of them
B. both of whom
C. both who
D. they both
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