.Manufacturers should have professional productivity and technical knowledge to ______ the quality of the products. 
#73110
A
predict
B
promise
C
guarantee
D
determine
推荐题目
——Watch! ——I ____ but ____ I ____ anything unusual.
#82021
A
watched; have watched
B
have watched; am not seeing
C
was watching; wasn’t seeing
D
am watching; don’t see
Several pages were found _________ when the book _________ me.
#65008
A
missing; returned
B
gone; was returned to
C
lost; was returned
D
disappeared; was returned to