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【单选题】
溶液的酸碱度有pH值确定，当pH＞7时，溶液呈碱性；当pH＜7时，溶液呈酸性，下列图象中，能反映HCI溶液的pH值与所加水的体积V的变化关系的是（ ）A.
B.
C.
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皮皮学刷刷变学霸
举一反三
【单选题】If you ________ hard, you ________ in the exam.
A.
worked/ wouldn't have failed
B.
had worked/wouldn't fail
C.
had worked/wouldn’t have failed
D.
worked/wouldn’t fail
【简答题】As you worked late yesterday, you ______ have come this morning. A. needn’t B. mayn’t C. can’t D. mustn’t
【单选题】As you worked late yesterday,you_________have
A.
19. As you worked late yesterday,you_________have comethis morning. ( 全国 2) A.mayn’t
B.
can’t
C.
mustn’t
D.
needn’t
【简答题】It is necessary for you to have worked in this sector before.
【单选题】—Have you worked here since you graduated? —No, I ____________at a factory in Beijing for six years.
A.
would work
B.
have worked
C.
had worked
D.
worked
【单选题】He tried to join the army but ___ because of poor health.
A.
turned down
B.
was turned down
C.
turned out
D.
was turned off
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