问题
选择题
5．I thought things would get better, but ,______, they are getting worse.
A．as they are
B．as it is
C．as it was
D．as they were
答案
答案：B
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5．I thought things would get better, but ,______, they are getting worse.
A．as they are
B．as it is
C．as it was
D．as they were
答案：B
，OP=
R。求玻璃材料的折射率。