Question

8. He undertook to be here by ten o'clock,but up to now,he         . (turn)

他答应十点前到这里，伹到现在了他还没露面。

Answer 1

8. hasn't turned up yet turn up为固定短语，意为"出现，露面"，相当于appear。题干中有短语up to now作时间状语，因此谓语动词应用现在完成时。