搜题
王老师:19139051760(拨打)
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第1题

Billy has difficulty _______ the rest of the class.
· to keep up with
· to keep up
· keeping up with
· keepi
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第2题

______ me, I shall not returthere either.
· As long as
· As for as
· As for
· So as to
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第3题

WTO stands ________ the World Trade Organization.
· as
· like
· for
· by
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第4题

His ears are highly sensitive _______ any unusual sound ithe machine.
· of
· on
· to
· by
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