题目内容

One of the requirements for a fire is that the material______to its burning temperature.

A. heated
B. be heated
C. to be heated
D. being heated

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______, he does get irritated with her sometimes.

As he likes her
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C. Though much he likes her
D. Much as he likes her

By the first decade of the 21st century, international commercial air traffic is expected______ vastly beyond today's levels.

A. to have extended
B. being extended
C. to be extending
D. having been extended

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A. 正确
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It isn't cold enough for there______a frost tonight, so 1 can leave Jim's car out quite safely.

A. would be
B. to be
C. was
D. being