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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A．the foreigner knew
B．did the foreigner know
C．the foreigner has known
D．has the foreigner known

The DNA test, together with other tests,（）the prisoner'...

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

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单项选择题We have come to the conclusion（）this summer will be much hotter than before.

A．for
B．but
C．that
D．when