单项选择题

You can trust our product as we have（）control over its quality.

A．strict
B．limited
C．little
D．natural

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单项选择题
He attended school in England for several years, after（）he returned home.

A．what
B．that
C．which
D．whom
单项选择题
7（）

A．A professor.
B．An engineer.
C．A student leader.
D．A social worker.
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