31．—Bob! How’s your project? I heard you started it last Friday，right?
—Oh！I _________for it．But I haven’t decided when to do it．
| A．have prepared | B．had prepared | C．have been preparing | D．was preparing |
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31．—Bob! How’s your project? I heard you started it last Friday，right?
—Oh！I _________for it．But I haven’t decided when to do it．
| A．have prepared | B．had prepared | C．have been preparing | D．was preparing |
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