at a worse time

a, an, the などの冠詞はかなりアバウトなことがある。あったりなかったりすることもある、そうかと思えば絶対にこうでなくてはならないと言う場合もある。could not の後に続く at a worse time の時は必ず不定冠詞 a, an になる。2:10 the shocking photo could not come at a worse time for Depp. この写真は離婚騒動の渦中のデップにとって一番都合の悪い時に出てきてしまった。

Judge Grants Amber Heard's Request For Restraining Order Against Johnny Depp

https://www.youtube.com/watch?v=DYBFT2PMLjA  1:34 he couldn't have picked a worse spot. 偽の退役軍人が軍事基地の前で物乞いをやってばれてしまうのは、これ以上最悪の場所はないね。

https://www.youtube.com/watch?v=jjl5k14FQus  1:39 this could not come at a worse time for Ecuador.
The cost of rebuilding after massive Ecuador quake

https://www.youtube.com/watch?v=ckEW1UUN6UA  1:07 could not have happened at a worse time
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https://www.youtube.com/watch?v=UOMgXMQEdrY  5;33 Hans' death couldn't have come at a worse time.
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https://www.youtube.com/watch?v=ASUfb6CX3Z4  230 and it couldn't come at a worse time.
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練習問題解答
a-4599 at a better time