-Whose book is this?---It be Ning’s because it has her name on it.A. mustB. can’tC. mig

问题补充：

---Whose book is this?

---It be Ning’s because it has her name on it.

A. must

B. can’t

C. might

D. could

答案：

(答案→)A. must

B. can’t

C. might

D. could

解析：句意：这是谁的书？肯定是宁的书，因为上面写着她的名字。Must在表推测的时候，表示肯定；can’t 不可能；might和could都表可能。结合题意选A。