这道题是考查主谓一致吗

下面这道题是考查主谓一致吗?

Entering the room, the headmaster said, “Everyone _________ quiet, please.”

A. keep                        B. keeps                     C. is keeping                  D. to keep

【分析】此题容易误选B，因为主语 everyone通常被视为第三人称单数，所以其后谓语用 keeps。但事实上，最佳答案应是A，注意句末的 please，它表明此直接引语为祈使句，只不过该祈使句带上 everyone 这个主语。既然是祈使句，所以动词用原形，即选A。又如：

(1) Someone _________ the door; be quick, please.

A. open                        B. opens                       C. is opening                     D. to  open

(2) Everyone _________ over, please.

A. come                        B. comes                     C. coming                         D. to come

以上两题答案均选A，即选动词原形。两句均属带主语的祈使句，注意句末的 please。