单项选择题

Most electronic devices of this kind, ______ manufactured for such purposes, are tightly packed.

A. that are
B. as are
C. which is
D. it is
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单项选择题
In this factory, suggestions often have to wait for months before they are fully _______.
A. admitted
B. acknowledged
C. absorbed
D. considered
单项选择题
Achieving a high degree of proficiency in English as a foreign language is not a mysterious______without scientific basic.
A. process
B. practice
C. procedure
D. program
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