.Manufacturers should have professional productivity and technical knowledge to the quality of the products.
A. predict
B. promise
C. guarantee
D. determine
网友回答
A. predict
B. promise
(答案→)C. guarantee
D. determine
解析：本题考查动词辨析。predict预测；promise许诺；guarantee保证；determine决定。根据句意为保证产品的质量，故选C。