我不得不谢绝他的邀请，因为我另有约会。
I had to decline his invitation because I had another appointment.
然而我有些应接不暇，因为我在几小时之内就得到了回复，于是不得不谢绝了一些志愿者工作机会，因此记住这个。
I was actually inundated with replies within hours and had to turn down a number of volunteering opportunities, so bear this in mind.
我恐怕不得不谢绝你的邀请。
我恐怕不得不谢绝你的邀请。不是我恐怕不得不谢绝你的邀请。因为我不愿意来，因为我不愿意来，而是因为我一直都非常忙。都非常忙。
I am afraid I have to decline your invitation. Not that I am unwilling to come, but that I have been very busy these days.
我恐怕不得不谢绝你的邀请。
我恐怕不得不谢绝你的邀请。
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