单项选择题

Jane studies in a medical school, but she（） for this book fair, since she is on vacation.

A. has worked
B. works
C. has been working
D. is working

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单项选择题
She（）always （） about her husband whenever she meets someone.

A. has...complained

B. had...complained
C. is...complaining

D. was...complaining
单项选择题
He left orders that no one（）his study until he came back.

A. should enter
B. ought to enter
C. must enter
D. would enter
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