单项选择题

Every device______ in the spacecraft must be designed and made with great care so as to be sure that nothing goes wrong in operation.

A．to be fitted
B．fitted
C．fitting
D．to have been fitted
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单项选择题
Memorization which does not include thinking and understanding______ students being unable to use what has been learnt.
A．results in
B．centers on
C．adjusts to
D．refers to
单项选择题
______that a society like the National Society for the Prevention of Cruelty to children is still needed in a civilized country.
A．How does it come
B．How it comes
C．How did it come about
D．How did it come
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