I could have turned to Mr. Smith for help, but he ______ too busy then.
| A．is | B．was | C．should be | D．has been |
相关试题
In 1519 ____ traveler who went to American from Europe discovered ____tomato．
| A．the; the | B．the ; a | C．a:．a | D．a; the |
—Excuse me , you left this handbag in the shop．
| A．It's my fault． | B．Oh, thank you． |
| C．I'm sorry． | D．It's mine! |
When Japanese invaded China, all the Chinese refused to ____ themselves to their poor status and fought back.
| A．resign | B．adjust | C．devote | D．owe |
____ I went to the seaside, I picked up a great many shells.
| A．The first time | B．For the first time | C．At first | D．By the first time |
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