students are practicing English with each other at the English corner.
A. The number of; to speak
B. A great deal of; spoken
C. A great many of; speak
D. A number of; speaking
网友回答
A. The number of; to speak
B. A great deal of; spoken
C. A great many of; speak
(答案→)D. A number of; speaking
解析：考查数词及动词用法。The number of……的数目，谓语动词用单数；A great deal of;许多，或接不可数名词；A great many of许多；A number of; practice doing练习做某事，故选D。