单项选择题

Up to now, the work has been easy.()

A. So
B. So long
C. So far
D. So that

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单项选择题
This table is strong and durable.
A．long-lasting
B．extensive
C．far-reaching
D．eternal
单项选择题
A new system of quality control was brought in to overcome the defects in the firm's products.()

A. invested
B. introduced
C. installed
D. insisted
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