When first __________ to the market, the computer software was not a success due to its complexity in operation.
| A．introducing | B．being introduced |
| C．introduced | D．to be introduced |
相关试题
I failed again in the examination and only then _____ how much time I had wasted.
| A．I realized | B．I had realized | C．did I realize | D．had I realized |
She knows so much about England. She ________ there before.
| A．must be | B．must have been | C．must live | D．must have lived in |
There are all kinds of dolls in the shop. _________ she wants, the little girl’s parents are ready to buy it for her.
| A．However | B．Whatever | C．Whichever | D．Whenever |
After he was knocked down by a bike, he was badly hurt and had to ______ to his feet.
| A．stand | B．struggle | C．run | D．sit |
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