单项选择题

The number of tourists from the west (have) (more than doubled) since China (adopted) the open door policy two decades (ago).

A．have
B．more than doubled
C．adopted
D．ago
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单项选择题
(Few of the people) in that area realize (the importance of) protecting the environment, (either do they know how) to do (so).
A．Few of the people
B．the importance of
C．either do they know how
D．so
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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