单项选择题

Look out!Don’t get too close to the house（）roof is under repair．

A.whose
B.which
C.of which
D.that

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单项选择题
NASA’s Mars detectot，Opportunity，succeeded in finding signs that water once existed on the planet．It is now believed that the planet（）life．

A.should once support
B.should once have supported
C.could once support
D.could once have supported
单项选择题
why（）we eat out when we can easily cook ourselves at home？

A.must
B.shall
C.can
D.may
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