16. The dentist ________ see you tomorrow morning. |
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A. can |
B. could |
C. will be able to |
D. should |
17. When she was young, she ________ swim very quickly. |
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A. must |
B. had to |
C. could |
D. can |
18. You ________ go out at night. It’s not allowed. |
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A. mustn’t |
B. don’t have to |
C. shouldn’t |
D. might not |