单项选择题Anyone can borrow books from the library ______ he keeps them clean and returns then on time.

A. even if
B. unless
C. so that
D. as long as


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参考答案:participate
参考答案:experience
5.单项选择题The city of London, ______ repeatedly between 1940 and 1941, lost many of its famous churches.

A. bombed
B. to bomb
C. bombing
D. having bombed

7.单项选择题But for their generous help, the experiment ______ completed so quickly.

A. shouldn’t be
B. couldn’t have been
C. wasn’t
D. hadn’t

9.单项选择题How much does the club cost a year

A. Three pounds.
B. Five pounds.
C. Twelve pounds.
D. Ten pounds.