问题

Can you spare time to have dinner with me this evening—Well, I don’t know _________________.
A:that I can finish my work by then
B:if can I finish the work by then
C:that can I finish the work by then
D:whether I can finish the work by then;
B:if can I finish the work by then
C:that can I finish the work by then
D:whether I can finish the work by then;
正确答案是: