单项选择题

--Would you like some butter
--No, thanks. I’m ______ a diet.

[A] in
B. on
C. at
D. of
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单项选择题
When is the clinic open in a week
A. From Monday to Friday.
B. On weekdays except Thursday.
C. During the whole week.
单项选择题
What’s the relationship between the speakers
[A] Husband and wife.
B. Ticket assistant and customer.
C. Friends.
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