填空题
The guards (leave) ______ the building by the time the alarm sounded.
【参考答案】
had left
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单项选择题
A.A hotel clerk.B.A professor.C.A student.D.A park employee.
A.A hotel clerk.
B.A professor.
C.A student.
D.A park employee.
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填空题
What percentage do the poor countries account for in the worldIt’s estimated that ______ countries of the world are very poor.
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