单项选择题

With the introduction of the electronic computer, there is no complicated problem () can be solved quickly.

A. that
B. which
C. but
D. as

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单项选择题
After the theft of his car he put in an insurance () for ￡3,000.

A. account
B. invoice
C. assessment
D. claim
单项选择题
The disease has completely () in this country.

A. died out
B. died down
C. died away
D. died off
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