By the time he was twelve he ______ a chemistry lab of his own.
| A．built | B．has built | C．had built | D．was building |
相关试题
---John, how did your English exam go?
-----I thought I ____,but in fact I came in the top 10% in the class.
| A．should have failed | B．couldn’t have failed |
| C．might have failed | D．mustn’t have failed |
---I feel the house shaking.
----So do I .It ___ must be sign of an earthquake most probably. Let’s hurry to leave here.
| A．ought to | B．could | C．can | D．might |
Suddenly we felt the _________atmosphere grow tense as neither of the sides would give in.
| A．atmosphere | B．state | C．situation | D．phenomenon |
Faced with the hard financial ____________, all the countries in the world should learn to cooperate to get it over.
| A．situation | B．position | C．phenomenon | D．state |
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