-- I think we'll 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 |
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-- I think we'll 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 |
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