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
Our shop has entered into a ______ with a clothing firm to buy 100 coats a week.
A．contract
B．contrast
C．conflict
D．contact
单项选择题
The speaker, ______ for his splendid speeches, was warmly received by the audience.
A．having known
B．being known
C．knowing
D．known
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