No one can tell when they．
When they _______, I'll let you know at once．（ ）
| A． |
return； will arrive |
| B． |
will return；reach |
| C． |
will return；arrive |
No one can tell when they．
When they _______, I'll let you know at once．（ ）
| A． |
return； will arrive |
| B． |
will return；reach |
| C． |
will return；arrive |
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