In order not to be disturbed, I spent three hours _______ in my study.
| A．locking | B．locked | C．to lock | D．to be locked |
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I was just about ___ road ___ a ship came to us.
| A．traveling on; while | B．to travel on; while |
| C．traveling by; when | D．to travel by; when |
The teacher said there were twelve _____ who had failed in the exam.
A at all B in all C all in D all in all
.The teacher recommended that every student England party.
A. took active part in B. takes active part in C
. take active part in D. would take active part in
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