The clever method (was) (paid attention) by very few technicians (until) (the) early 1970s.

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问题 The clever method (was) (paid attention) by very few technicians (until) (the) early 1970s.

选项 A、was
B、paid attention
C、until
D、the

答案B

解析 正确的表达应该是pay attention to。
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