单项选择题

A．Ahad been working; had had B．have worked; hadC．am wor……

--- I _________ so busily recently that I _________ no time to help you with your maths. --- That’s OK. I can manage it by myself.

A．Ahad been working; had had
B．have worked; had
C．am working; will have
D．have been working; have

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