Scientists estimate that plants and animals lived _____ 3.5 billion years ago. [
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Scientists estimate that plants and animals lived _____ 3.5 billion years ago. |
[ ] |
A. as far as B. as many as C. as long as D. as old as |
答案
C |
举一反三
Facing a beggar, I may feel this poor person needs help, and the need will not be met _____ I put my hand in my pocket now. |
[ ] |
A. since B. in case C. unless D. while |
_____ you"ve tried it, you can"t imagine how tasty the fish I cooked is. |
[ ] |
A. Because B. Unless C. Although D. So long as |
It has come to be realized ______ particular matters in the air expose us to life"s real danger. |
[ ] |
A. what B. which C. when D. that |
He made a mistake, but then he corrected it _____ it got worse. |
[ ] |
A. until B. when C. before D. as |
______the bad weather, they finished all the work on time. |
[ ] |
A. Though B. Because of C. No matter how D. Despite |
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