8. He was so deep in thought, thinking of the problem ______ he knocked into the
题型：不详难度：来源：
8. He was so deep in thought, thinking of the problem ______ he knocked into the tree without noticing it.
| A．when | B．while | C．because | D．That |
答案
解析
举一反三
19. His family members gave some examples of ______ his drinking and smoking had affected the family.
| A．that | B．what | C．how | D．Whether |
25. The only language ____is easy to learn is the mother tongue.
| A．which | B．whose | C．that | D．it |
29. It is during the Second World War ____he died.
| A．when | B．after | C．before | D．That |
43.It was not until 1936________basketball became a regular part of the Olympic Games.
44.
| A．that | B．when | C．which | D．then |
48.It was great joy_________he received the news that his long lost son would return home
49.
| A．as | B．that | C．so | D．for |
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