1 . You’d better avoid ________ (raise) a question like that which disturbs the class. （所给词的适当形式填空）
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2 . Due to the lack of money，I recommend that he________ （avoid）using this expensive piece of equipment.
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3 . Only after David was asked to pay more attention ______ repeating the same mistake.
| A．he avoided | B．did he avoid |
| C．had he avoided | D．he had avoided |
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