在消耗ATP的情况下,电子可从复合体Ⅳ流动到复合体Ⅰ。()
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I would have gone to the hospital to visit him had it been possible, but I______fully occupied last week.
A. were
B. has been
C. have been
D. was
Before the invention of refrigeration, the______of fish and meat was a problem.
A. keeping
B. preservation
C. maintenance
D. protection
Don't stay______too late, or you'll be sleepy in class tomorrow.
A. on
B. out
C. up
D. for
I hope you are not______that I obtained this money dishonestly.
A. implying
B. concerning
C. involving
D. conveying