单项选择题

A new study finds out that a kid can learn without（）what he is doing.

A、realize
B、realized
C、realizing
D、to realize

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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

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

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