单项选择题

In Disneyland, every year, some 800 000 plants are replaced because Disney refused to（）signs asking his "guests" not to step on them.

A. take down
B. call for
C. put up
D. set up

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单项选择题
I have written to him because he phoned me shortly afterwards.（）

A. ought to
B. must
C. couldn't
D. needn't
单项选择题
As there was a power cut in the hospital, the surgeon had to（）the operation.

A. call for
B. call on
C. call off
D. call up
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