单项选择题

Experiments have already been done in this field, but only（）a small scale.

A、 at
B、 on
C、 in
D、 by

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单项选择题
He could remember（）along the road just before the accident happened, but he couldn't remember the accident itself.

A、 drive
B、 to drive
C、 driving
D、 drove
单项选择题
（）the college, the students found they had many things to adjust to.

A、 Entering
B、 To enter
C、 Entered
D、 Having entered
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