--- I so busily recently that I no time to help you with your math. --- That’s OK. I can

问题补充：

--- I so busily recently that I no time to help you with your math.

--- That’s OK. I can manage it by myself.

A. have been working; have

B. have worked; had

C. am working; will have

D. had been working; had had

答案：

(答案→)A. have been working; have

B. have worked; had

C. am working; will have

D. had been working; had had

解析：recently常与现在完成时或一般过去时连用。第二空应用一般现在时。