题文
He found it increasingly difficult to read，__________ his eyesight was beginning to fall.
| A．though |
| B．for |
| C．but |
| D．so |
推荐试卷
He found it increasingly difficult to read，__________ his eyesight was beginning to fall.
| A．though |
| B．for |
| C．but |
| D．so |
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