题文
You ____ him so closely; you should have kept your distance.
| A．shouldn't follow | B．mustn't follow |
| C．couldn't have been following | D．shouldn't have been following |
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You ____ him so closely; you should have kept your distance.
| A．shouldn't follow | B．mustn't follow |
| C．couldn't have been following | D．shouldn't have been following |
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