单项选择题

All the class burst _________ laughter when they saw the funny picture.

A．in
B．at
C．on
D．into
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单项选择题
The boss told us not to use more material than is necessary.
A．老板让我们按需要用料，别多用材料。
B．老板让我们不要多用材料，这没必要。
C．老板没让我们用必需要用的材料。
D．老板让我们不要用不必要的材料。
单项选择题
_________ in his position, I'd have left there immediately.
A．was I
B．I was
C．Were I
D．I were
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