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

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单项选择题
So little（）about China that he could not find Beijing in the world map.

A．the foreigner knew
B．did the foreigner know
C．the foreigner has known
D．has the foreigner known
单项选择题
The DNA test, together with other tests,（）the prisoner's innocence.

A．proves
B．prove
C．proving
D．have proved
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