单项选择题

—Has the doctor come yet
—No, but he ______ now, for it's been 2 hours since he was ______.

[A] hasn't; called for
[B] must have; sent for
[C] shall; looked for
[D] should have; sent for
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单项选择题
What do you think ______ the way he settled the problem
[A] of
[B] in
[C] out
[D] on
单项选择题
It was the training that he had as a young man ______ made him such a good engineer.
[A] what
[B] that
[C] which
[D] whoever
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