单项选择题

Criticism and self-criticism is necessary ______ it helps us to find and correct our mistakes.

A．by that
B．at that
C．on that
D．in that

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单项选择题

Americans eat ______ as they actually need every day.

A．twice as much protein
B．twice protein as much twice
C．twice protein as much
D．protein as twice much

单项选择题

The British are not so familiar with different cultures and other ways of doing things, ______ is often the case in 'other countries.

A．as
B．what
C．so
D．that

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