16. If we had taken effective measures much earlier, the river so seriously now.
A. is not polluted
B. would not be polluted
C. had not been polluted
D. would not have been polluted
16. B考查錯綜時間的虛擬語氣。，據(jù)從句的謂語had taken effective measures可知，從句表示與過去事實相反，因此條件從句用過去完成時。根據(jù)時間now可知，主句與現(xiàn)在的事實相反，所以用"would+動詞原形"的形式。故選B。
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7. To begin with, you should make a list of the names of those . Then write the invitation cards.
A. to invite B. having invited
C. being invited D. to be invited
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A. should B. need C. must D. can
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10. ―It is unbelievable that John should have fought with the policeman.
―Well, if one ask for trouble, it just can't be helped.
A. will B. must
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12. The boy's parents the operation last week had it not been for the donations from our school.
A. couldn't have paid for
B. couldn't pay for
C. shouldn't have paid for
D. wouldn't pay for
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20. ―What do you think is the matter with your car?
―Well, it start at all. I mean I turned the key and nothing happened.
A. shan't B. won't
C mustn't D. shouldn't
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選擇適當(dāng)?shù)那閼B(tài)動詞填空
1. No student ________ go out of school after eleven o'clock at night without the teacher's permission, (will/shall)
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