—Largequantitiesoftime

問題詳情：

 — Large quantities of time ______ been spent on the discussion.

   — Yes, and most students are now for the requirement that all the students      not take their cell

      phones into the classroom.

   A. is; will                   B. has; can                C. are; must               D. have; should

【回答】

D

知識點：主謂一致

題型：選擇題