单项选择题

It was not until I () your letter that I ()all about the matter.

A．have read; knew
B．would read; had known
C．read; had known
D．had read; knew

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单项选择题
What a great weight the mother felt () her mind the moment she found her lost son!

A．turned off
B．taken off
C．set free
D．brought into
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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