The introduction of a computer into the production line has raised the output more than if one hundred more trained workers () put on the job.
A. had been
B. were
C. be
D. would be
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It is absolutely necessary for us to have sufficient oxygen if we ()to go on living
A. are
B. were
C. had
D. having
Who () has read Tolstoy’s great novels can forget their fascination.
A. who
B. which
C. that
D. ever
If you had worked hard before, you () worried about the coming examination now.
A. would not be
B. would not have been
C. are not
D. will not be
Mr. Smith has been away from home for a long time. He is looking forward to() his wife.
A. hear from
B. hearing from
C. hear of
D. hearing of