Li Lei can’t go hiking with us today because he take care of his sick mother.A. has toB. m

问题补充：

Li Lei can’t go hiking with us today,because he take care of his sick mother.

A. has to

B. may

C. mustn’t

D. needn’t

答案：

(答案→)A. has to

B. may

C. mustn’t

D. needn’t

解析：has to不得不；may可以；mustn’t禁止；needn’t不必。句意：今天李磊不能和你去远足了，因为他不得不照顾他生病的母亲。故选A。