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All of the guests ___by 9 o'clock,but the host ____until 15

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All of the guests ___by 9 o'clock,but the host ____until 15 minutes later A have arrived;
All of the guests ___by 9 o'clock,but the host ____until 15 minutes later
A have arrived;didn't appear B had arrived;didn't appear
C arrived;hadn't appeared D had arrived;hasn't appeared
选哪个?为什么?
选B
第一个空:by 9 o' clock 用过去完成时
第二个空:前面是过去的过去,后面later就是过去,所以是didn't