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【单选题】
—— How did you pass the challenging test? —— It was a long time I found a series of suitable methods.A.
when
B.
until
C.
since
D.
before
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反馈参考答案：
举一反三
【判断题】The only purpose of parallel systems is to achieve maximum speedup on a single problem.
A.
正确
B.
错误
【单选题】In 1636, Harvard（哈佛大学）is one of the most famous universities in the United States.
A.
Being founded
B.
It was founded
C.
Founded
D.
Founding
【简答题】河口区潮汐涨落过程：涨潮涨潮流、（）、落潮涨潮流、（） 。
【单选题】Jonathan was finally enrolled in a law school, which was affiliated ______ Harvard University.
A.
by
B.
with
C.
from
D.
on
【单选题】If a particular vaccine is produced only by one company at a single facility, there is a possibility that the supply of vaccine could grow ______ if the company decides to cease production.
A.
useless
B.
inexpensive
C.
abstruse
D.
repugnant
E.
scarce
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