题文
To prevent this from happening again, John Snow suggested that the source of all the water supplies __________.
| A．be examining | B．should be examined |
| C．was examined | D．to be examined |
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To prevent this from happening again, John Snow suggested that the source of all the water supplies __________.
| A．be examining | B．should be examined |
| C．was examined | D．to be examined |
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