1.The prison sentence he received on the number of crimes he had committed.
A.based B.was based
C.had been based D.was basing
解析：考查动词短语搭配。句意：一个人所获的刑罚与他所犯罪的数量有关。be based on以……为基础。
答案：B
2.Jerry didn't his primary school classmate Mary until he listened to her selfintroduction.
A.know B.acquire
C.recognize D.realize
解析：know知道，了解；acquire获得；recognize辨认出；realize意识到，实现。由句意可知C项正确。
答案：C
