______ over and over again, but he still couldn’t understand.
| A．Having explained | B．Having been explained |
| C．Explaining | D．It had been explained |
Harry is feeling uncomfortable. He _______too much at the party last night.
| A．could drink | B．should drink |
| C．would have drunk | D．must have drunk |
A clean environment can help the city bid for the Olympics, which ________ will promote its economic development.
| A．innature | B．inreturn | C．inexchange | D．infact |
After several rounds of the Voice of China Competition, Ji Ke Jun Yi _______ because of her excellent voice and performance.
| A．put out | B．picked out | C．broke out | D．stood out |
Cars do cause people some health problems, in fact far more serious _____ than computers do.
| A．one | B．it | C．ones | D．those |
____ under the tree was a charming girl aged about seventeen and eighteen.
| A．Sat | B．Sitting | C．To sit | D．Sit |