问题

I can’t imagine what air we would be breathing in if we __________ anything to stop air pollution.

A:hadn’t done
B:didn’t do
C:haven’t done
D:don’t do;

正确答案是：

同类题型

Here is 800-word reportin today’s newspaper. It’s about the National Day military parade. —It’swonderful show I have ever watched.

Mr. Smith was so angry at all _____ Billwas doing ______ he left.

What’s made Tommy so upset— ________the game. It shocked him so much.

ly don’t know how to thank you , but for yourhelp, I ______ my lost necklace．

ou think I really _____ the bad handwriting in your composition at yesterday’ s meeting—Sure, Why _____ you always pick holes in everything I write