单项选择题

A．Because they get low grades.
B．Because they exhaust the reference sources in the library.
C．Because they can spend only limited time with the professors.
D．Because their teachers do not grade every assignment of them.
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单项选择题
A．She needed the notes last week.B．The man can return her notes after the exam.C．She’ll have enough time to prepare for the exam.D．The man won’t need to study the notes for the exam.
A．She needed the notes last week.
B．The man can return her notes after the exam.
C．She’ll have enough time to prepare for the exam.
D．The man won’t need to study the notes for the exam.
单项选择题
A．The roads are too crowded to drive.B．It’s difficult to catch a bus or a train.C．They are too young or too old to drive.D．Train and bus services are becoming poorer.
A．The roads are too crowded to drive.
B．It’s difficult to catch a bus or a train.
C．They are too young or too old to drive.
D．Train and bus services are becoming poorer.
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