单项选择题

Professor Einstein's book will show you______ can be used in other contexts.

A．that you have observed
B．that how you have observed
C．how that you have observed
D．how what you have observed
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单项选择题
The teacher made strenuous efforts to read the faint,______ handwriting in his students' exercise books.
A．illegal
B．illiterate
C．illegible
D．illustrative
单项选择题
My advice is: only wear such clothes______ really necessary.
A．as they are
B．as are
C．as is
D．as it is
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