If Trial 4 had been extended, at approximately what time would 0.45 mL of 0 2 have reacted?
A.70 sec
B.140 sec
C.240 sec
D.270 sec
If he()that the mushroom was poisonous, he ()it.Luckily he was sent to the hospital immediately.A、was warned, would not eatB、had been warned, would not have eatenC、would be warned, had not eatenD、would have been warned, had not eaten
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Perhaps the experiment _____ by this time tomorrow.A、has been doneB、will have been boneC、will doD、would have done
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He must have had an accident, or he _____ thenA:would have been hereB:would be hereC:should be hereD:had just had
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