单项选择题

A．Mr. Smith is very kind.
B．The man should not worry.
C．She is worried.
D．She likes Mr. Smith.
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单项选择题
Mouthwashes are not an effective cure for bad breath mainly because ______.
A．they can’’t mask the bad odor long enough
B．they can’’t get to all the offending bacteria
C．their strong smell mixes with bad breath and makes it worse
D．they can’’t cover the thick layers of mucus
单项选择题
Why didn’’t the laid-off workers like to do home services in the past
A．Low salary.
B．Lower social status.
C．Dirty working condition.
D．Too much extra work.
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