单项选择题

John as well as Jack （） just been back from an important meeting.

A. have
B. has
C. had
D. must have

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单项选择题

Let’s stop to take up another subject, （） we

A. oughtn’t
B. don’t
C. shall
D. should

单项选择题

I then listened to the boy （） the lesson written on the blackboard.

A. read
B. reading
C. to read
D. having read

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