22. The computer programs are a puzzle to me. The more I think of them, the more questions I think of .
| A．ask | B．asked | C．being asked | D．to ask |
So difficult ________ it to live in an English-speaking country that I determined to learn English.
| A．I have felt | B．have I felt | C．I did feel | D．did I feel |
—You forgot your purse when you went out. —Good heavens, ________.
| A．so did I | B．so I did | C．I did so | D．I so did |
Of the making of good books there is no end; neither ________ any end to their influence man’s lives.
| A．there is | B．there are | C．is there | D．are there |
Only when the war was over ________ to his hometown.
| A．did the young soldier return | B．the young soldier returned | C．returned the young soldier | D．the young soldier did return |
Not until I began to work ________ how much time I had wasted.
| A．didn’t I realize | B．did I realize | C．I didn’t realize | D．I realize |