单项选择题

So many directors _________, the board meeting had to be put off.

A．were absent
B．being absent
C．been absent
D．had been absent
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单项选择题
_________ difficulties we may come across, we'll help one another to overcome them.
A．However
B．Whenever
C．Wherever
D．Whatever
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．put off
B．put down
C．put out
D．put up
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