单项选择题

When you read books, you had better make marks（）you have questions.

A．where
B．in where
C．at which
D．which

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单项选择题
She stayed at home during the whole summer vacation（）she could look after her old grandmother.

A．in case
B．now that
C．so that
D．as though
单项选择题
The designer himself is not sure whether this software is appropriate（）children under 12 years old.

A．with
B．in
C．for
D．of
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