—What do you think of John?—He’s a good boy but he be really stubborn at times.A. canB.

问题补充：

—What do you think of John?

—He’s a good boy, but he be really stubborn at times.

A. can

B. might

C. must

D. need

答案：

(答案→)A. can

B. might

C. must

D. need

解析：本题考查情态动词，can能，会，偶尔发生的可能性，有时会；might可能，或许，也许；must必须，不可，一定，偏偏； need 必要，需要，需要做；根据句意“你认为约翰怎么样？他是一个好孩子，但有时真的会很固执”。故选A。