46. _A_ the calculation is right scientists can never be sure that they have included all variables and modeled them accurately.
A Even if B As far as C If only D So long as
even if 即使,即便; so long as 只要。
47. My train arrives in New York at eight oclock tonight. The plane I would like to take from there _B_ by then.
A would leave B will have left C has left D had left
将来完成时:will have + 动词过去分词。
49. Harry was _A_ by a bee when he was collecting the honey.
A stung B stuck C bitten D scratched
sting v. 叮,蛰; bite v. 咬; scratch vt. 抓伤,划破。
once bitten, twice shy. 一朝被蛇咬,十年怕井绳。
50. The thief tried to open the locked door but _B_.
A in no way B in vain C without effect D at a loss
in vain 徒劳,白费工夫; But很少与介词without联用; at a loss 不知所措。
52. _B_ seeing the damage he had done, the child felt ashamed.
A By B On C At D For
on后面加动词ing形式表示在之后这个时间概念。
54. Research findings show we spend about two hours dreaming every night, no matter what we _C_ during the day.
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