Thecountry’schiefexportsarecoal,carsandcottongoods,cars_____themostimportantofthese.
A、havebeenC
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If you _____ in such a hurry,you _____ sugar into the sauce instead of salt.
It is not uncommon for there _____ problems of communication between the old and the young.
The three men tried many times to sneak across the border into the neighboring country_____ by the police each time.
The back garden of our house contains a lawn ，____very pleasant to sit on in summer.
You____that letter to James. However ， you didn't.
