问题

His lack of professional knowledge ______for the failure of the experiment. [ ]

A: accounted
B: explained
C: counted
D: contributed

正确答案是：

同类题型

It’s said that he stays up studying every night — _____ he’s excellent in English! [ ]

Of the two T-shirts，I’d choose the___one to savesome money for a book．

do you enjoy __________ our weekend,fishing or watching TV

My hand ________ and I will have my clothes ________.

She looked at the beautiful scarf and wondered .