单项选择题

--"I bought this shirt for 35 yuan yesterday." --"It's on sale today for only 29. You should have waited." --" Oh, really But how _________ I know."

A．could
B．did
C．can
D．do
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单项选择题
_________ men have learned much from the behavior of animals is hardly new.
A．That
B．What
C．Whether
D．Which
单项选择题
This kind of glasses manufactured by experienced craftsmen _________ comfortably.
A．wears
B．is worn
C．wearing
D．are worn
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