问题
He seems ____ something valuable. He looks so worried.
A:has lost
B:to lose
C:to be losing
D:to have lost
B:to lose
C:to be losing
D:to have lost
正确答案是:
同类题型
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___ years ago, the population of China was over 20 million.
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________you _____your homework yet? —Yes, I ___it ten minutes ago.