题文
It’s high time that they _____ some serious work right now.
| A．should have got down to | B．would get down to |
| C．got down to | D．get down to |
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It’s high time that they _____ some serious work right now.
| A．should have got down to | B．would get down to |
| C．got down to | D．get down to |
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