单项选择题

(Even though) he (had been studying) English for three years (before) he came to England, it is still difficult for him to make himself (understand).

A．Even though
B．had been studying
C．before
D．understand
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单项选择题
I have lost so (much weight) recently (so) all my clothes are too big; I (must) have them (taken) in.
A．much weight
B．so
C．must
D．taken
单项选择题
Doctors believe that lung cancer is caused ______ by smoking too much.
A．part
B．at part
C．in part
D．with part
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