-- I think we'll give Bob a ring.-- We . We have been out of touch with him for ages.A.

问题补充：

-- I think well give Bob a ring.

-- We . We have been out of touch with him for ages.

A. will

B. may

C. have to

D. ought to

答案：

A. will

B. may

C. have to

(答案→)D. ought to

解析：可联系答.案.网客服索取。