28. Mr. Duncan raised an unnecessary question _______ he then failed to find an answer.
| A．with which | B．for which | C．to which | D．by which |
A Sichuan government official expressed their thanks through CCTV for the aid they ______ in the last three years.
| A．would receive | B．are receiving | C．have received | D．had received |
Only after they had carried out over ten experiments ______ the decision.
| A．they reached | B．they reach | C．did they reach | D．do they reach |
It’s reported that the price of meat this month is ______ that of last month.
| A．half as lower as | B．half lower than |
| C．lower half than | D．as half low as |
Thank you for sending us ______ vegetables. You have done us ______ great help.
| A．不填; the | B．the; a | C．不填; 不填 | D．the; 不填 |
They tried to find a table for two. But they were all ______.
| A．given away | B．kept away | C．taken up | D．used up |