问题

So difficult ______ it to work out the problem that I decided to ask Tom for advice.
A:I did find
B:did I find
C:I have found
D:have I found
B:did I find
C:I have found
D:have I found
正确答案是:
同类题型
Some pre-school children go to a day care center, they learn simple English games and songs.
I have a lot of homework to do today, _________ I cannot go swimming with you.
Tom’s father, as well as his brothers, ________ in New York for a few more days
Carmen likes musicians who _______ different kinds of music.
Never forget to bring your homework with_______.–__________.