that we can’t get the necessary equipment we will have to give up the experiment.A. IfB.

问题补充：

that we can’t get the necessary equipment , we will have to give up the experiment.

A. If

B. Supposed

C. Provide

D. Assuming

答案：

A. If

B. Supposed

C. Provide

(答案→)D. Assuming

解析：考察连词，if 如果，跟从句，不能跟that引导的句子 ，B应为suppose或者supposing，意为，假如 C 应为provided that， assuming 假如

句意为，假如我们不能得到需要的设备，我们将不得不放弃这个实验。