单项选择题

—"Is Philip over his cold yet" —"He ______. He went ice-skating yesterday."

A．had to
B．ought to
C．must be
D．must have
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单项选择题
______ I a billionaire, I would travel in space like an astronaut.
A．If only
B．Wishing
C．Were
D．Should
单项选择题
She regrets ______ idle when young.
A．to have been
B．her being
C．her having been
D．having been
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