单项选择题

_____ we’ll do is to leave Mum a note to tell her that we won’t be back till tomorrow morning.

A．What
B．If
C．that
D．Whether
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单项选择题
Einstein was the man _____ Theory of Relativity has influenced our ideas of time and space.
A．who
B．that
C．whose
D．of whom
单项选择题
Scientific research indicates that two-thirds of the earth surface _____ with water.
A．covered
B．are covered
C．covers
D．is covered
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