When the ship sailed out from Thailand, the 16 sailors on board __ that only half of them would return again.  

A. will never think                          B. can never think  

C. needn't have thought                  D. couldn't have thought  

When the ship sailed out from Thailand, the 16 sailors on board __ that only half of them would return again.

A．will never think                      B．can never think

C．needn't have thought                  D．couldn't have thought