46.Heating ________ into the students‘ dormitories now.
A. is putting B. is being put C. is been put D. has been putting
47.This page needed ________ again.
A. being checked B. checked C. to check D. to be checked
48.In some parts of the world， tea ________ with milk and sugar.
A. is serving B. is served C. serves D. served
49.If I had remembered ________ the window， the thief would not have got in.
A. to close B. closing C. to have closed D. having closed
50.The ancient Egyptians are supposed _______ rockets to the moon.
A. to send B. to be sending C. to have sent D. to have been sending
参考答案：
46.正确答案：B
答案解析：此题考查被动语态的进行式：be +being +PP.(过去分词)。
47.正确答案：D
答案解析：本句主语是this page，与check是被动的关系。need to be checked：需要被核实。
48.正确答案：B
答案解析：因为serve是及物动词，其动作承受者tea作主语，表示经常发生的情况，故用一般现在时的被动语态。
49.正确答案：A
答案解析：本句的意思是：“我要是记得把窗子关起来的话，小偷就进不来了。”remember后接动名词表示记得过去曾做过某事，接不定式则表示记得要做某事。本句说的是：“记得把窗子关起来”。因此A)to close是答案。注意remember后面不能用动词不定式的完成式。至于选项B) closing，因为这里“关窗子”这件事“我”并没有做，所以是不对的。
50.正确答案：C
答案解析：在本句中，send 为短暂性动词，不能用进行时态。所以B和D两项错误。A和C的区别在于不定式的时态，句首表示时间概念的ancient表明不定式动作在句子谓语动作之前，不定式要用完成式， 因而答案是C.
