Helen________her keys in the office so she had to wait until her husband________home．
| A．has left；comes |
| B．left；had come |
| C．had left；came |
| D．had left；would come |
Helen________her keys in the office so she had to wait until her husband________home．
| A．has left；comes |
| B．left；had come |
| C．had left；came |
| D．had left；would come |
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