made, were making, were made; in, to, on<br>Experiments____to adapt this variety of shrimp ______

made, were making, were made; in, to, on
Experiments____to adapt this variety of shrimp _______ fresh water.

made, were making, were made; in, to, on
Experiments____to adapt this variety of shrimp _______ fresh water.
【正确答案】：were made, to

企源知识库