77. --- Have all the important letters been delivered at the first time?
--- I’m sorry. _______ only 40% of them.
| A．It is | B．They are | C．There are | D．It has been |
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77. --- Have all the important letters been delivered at the first time?
--- I’m sorry. _______ only 40% of them.
| A．It is | B．They are | C．There are | D．It has been |
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