单项选择题

Many people () cigarette ends carelessly.

A. throw to
B. throw to
C. throw at
D. throw away
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He( )English for eight years.
A. has learned
B. learned
C. learns
D. is learning
单项选择题
Sometimes a situation will ()a direct style. of management.
A、call up
B、call for
C、call on
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