It was in 1976 we began to introduce this new technique. A. when B. which C. since D. that 【查看更多】

 

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It was in 1976      we began to introduce this new technique.

A.when              B.which             C.since             D.that

 

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It was in 1976      we began to introduce this new technique.

A.when              B.which             C.since             D.that

 

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