单项选择题

______ such a good chance, he planned to learn more.

A．To be given
B．Having been given
C．Having given
D．Giving
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单项选择题
______ that they may eventually reduce the amount of labor needed on construction sites.
A．So clever are the construction robots
B．So clever the construction robots are
C．Such construction robots are clever
D．Such clever construction robots are
单项选择题
--How is John's fever--Nothing serious, ______ it gets worse, we'll send for a doctor.
A．After
B．Unless
C．Until
D．If
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