“ Although ,” the boy said , “ _______ over and over , the maths problem remained confusing to me ” .
| A．explained | B．explain |
| C．explaining | D．having explained |
----–May I take this seat?
----- ________. It is occupied.
| A．Go ahead. | B．I am afraid not. | C．Yes, please. | D．Of course not. |
______ the plan means we must start from the very beginning.
| A．Abandoned | B．Abandoning | C．Being abandoned | D．Having abandoned |
She prepared a great meal to ______ the help of her neighbors in finding her lost little daughter.
| A．express | B．admit | C．explain | D．acknowledge |
.I recommended _____ an English-English dictionary, which I thought would be of great help to her studies.
| A．buying | B．bought | C．to buy | D．he bought |
The police turn the whole house _______ looking for clues.
| A．upside down | B．out front | C．side by side | D．down to earth |