Mary is going on a diet . as she has put on recently.A. weightsB. weightC. a weightD. the

问题补充：

Mary is going on a diet . as she has put on recently.

A. weights

B. weight

C. a weight

D. the weight

答案：

A. weights

(答案→)B. weight

C. a weight

D. the weight

解析：考查固定搭配。固定搭配put on weight发胖；增加体重；句意：Mary正在节食，因为他最近发胖了。故B正确。