By the end of last month she ___ over five hundred letters of congratulation from different parts of the worlD.

单选题

By the end of last month she ___ over five hundred letters of congratulation from different parts of the worlD.

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单选题

He_______here for 20 years by the end of next month.

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单选题

It’s reported that by the end of this year the output of cement in the factory( )by about 30%.

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单选题

The country has already sent up three unmanned spacecraft, the most recent _______ at the end of last March

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单选题

We _____ building the bridge by the end of next month.

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