Question

Jack ________ yet, otherwise he would have telephoned me．

1. A.
   mustn’t have arrived
2. B.
   shouldn’t have arrived
3. C.
   can’t have arrived
4. D.
   needn’t have arrived

Answer 1

C
表示對(duì)過(guò)去發(fā)生的事作推測(cè)，可用must have done，但must只可用于肯定的陳述句中，不可用于否定句和疑問(wèn)句中。在否定句和疑問(wèn)句中，應(yīng)用can。should have done表示過(guò)去本該做而沒(méi)有做的事；need have done表示過(guò)去本有必要做而沒(méi)有做的事。