Everyone here now. Let’s .A. are; begin；B. are; to beginC. is; to startD. is；start

问题补充：

Everyone here now. Let’s .

A. are; begin；

B. are; to begin

C. is; to start

D. is；start

答案：

A. are; begin；

B. are; to begin

C. is; to start

(答案→)D. is；start

解析：Everyone 作主语谓语动词用单三形式；let 后用动词原形。