________ you have to do the job, you should try your best to do it well even though it may be very difficult for you.
| A．Since | B．While |
| C．Unless | D．Though |
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________ you have to do the job, you should try your best to do it well even though it may be very difficult for you.
| A．Since | B．While |
| C．Unless | D．Though |
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