单项选择题

A．He lost his class schedule.
B．He could not drop the astronomy course.
C．He registered for too many classes.
D．He missed the deadline for adding courses.
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单项选择题
A．She can hear them crying very loudly at the zoo.B．She’s heard them panting and was told it was laughter.C．She’s read about it from Darwin.D．She used to work at a zoo.
A．She can hear them crying very loudly at the zoo.
B．She’s heard them panting and was told it was laughter.
C．She’s read about it from Darwin.
D．She used to work at a zoo.
单项选择题
A．He saw the big tower he visited on TV.B．He has visited the TV tower twice.C．He has visited the TV tower once.D．He will visit the TV tower in June.
A．He saw the big tower he visited on TV.
B．He has visited the TV tower twice.
C．He has visited the TV tower once.
D．He will visit the TV tower in June.
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