单项选择题

Richard went to the shop because he ______ a suit for his job interview.

A. need to buy
B. needed to buy
C. needed buy
D. did need buy
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单项选择题
A number of theories have been put forward about the possible causes of cancer.（）

A. 理论上早巳预言了癌症的病因。
B. 人们就造成癌症的病因提出了不少理论。
C. 大量的理论已经用于解释引发癌症的原因。
D. 人们已用大量理论来研究癌症的原因。
单项选择题
The writer of the text tells us that ______.
A. when some phobia breaks out in someone, he will feel too anxious about something

B. a person who fears people can run a race with others

C. a man afraid of heights can climb to a great building easily

D. everyone dares to take a lift where there is not a lifeguard
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