— he start at once or wait for a while?—Let him start at once.A. WillB. WouldC. DoesD. Sha

问题补充：

— he start at once or wait for a while?

—Let him start at once.

A. Will

B. Would

C. Does

D. Shall

答案：

A. Will

B. Would

C. Does

(答案→)D. Shall

解析：shall用于第一、第三人称疑问句中，表示说话人征求对方的意见和向对方请示。如：

Shall we begin our lesson?

When shall he be able to leave the hospital?