单项选择题

The book must ______ to the library.

A. return
B. be returned
C. to be returned
D. to returned
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单项选择题
Xiao Ling works very hard. She ______ by the teachers.
A. is always praised
B. praises
C. have been praised
D. always is praised
单项选择题
The patient ______ now ______ carefully.
A. is; being looked after
B. is; looking after
C. being; looked after
D. been; looking after
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