Ⅱ.单项选择(共15小题,每小题1分,满分15分)
21.We are trying to create_____less polluted world and the air pollution in our city will be less of ___ problem.
A. the, a B. a; 不填 C. a; a D. the, 不填
22.At first he refused to admit he had stolen the car but when he was shown the videotape, he ____and admitted everything.
A.broke up B broke away C broke down D broke out
23.He _______ busy yesterday, or he ___ you with your experiment.
A was, had helped B was , would have helped
C. had been, would had helped D had been, would help
24.You’d better take a pen when you go to the meeting ___ there is something important to write down.
A. as if B so that C in order that D in case
25 Hearing the dog barking fiercely, away _____.
A.did the thief flee B. was fleeing the thief
C. the thief fled D. fled the thief
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