21. ______rise in carbon dioxide is causing _______ steady increase in global warming.
a. the; a b.不填; a c. the;不填 d.a;the
22. - jerry, sorry to have kept you wait.
- it doesn’t matter, but i ________ you ________ later than me.
a. didn’t think, would be b. am thinking, will be
c. thought, had been d. never thought, would be
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