the work is really very difficult,___it's very interesting.A.yet B.however C.still D.at the same time

the work is really very difficult,___it's very interesting.
A.yet B.however C.still D.at the same time

有选项啊,那就选HOWEVER

表转折 however

but

应该是B。这个句子有转折意思，先说这个工作很辛苦，然后说它很有趣。