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
Great Salt Lake is fed by fresh-water streams, _________ is about four to five times as salty as the ocean.
A．yet
B．which
C．there
D．despite
单项选择题
The growth of part-time and flexible working patterns，and of training and retraining schemes，______more women to take advantage of employment opportunities.

A．have allowed
B．allows
C．allowing
D．allow
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