MIMO能够获得比单入单出（SISO），单入多出（SIMO）和多入单出（MISO）更高的信道容量。
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______she realized it was too late to leave.
A. No sooner it grew dark than
B. Hardly did it grow dark that
C. Scarcely had it grown dark than
D. It was not until dark that
Only under special circumtances ______ to surf online.
A. are freshmen permitted
B. freshmen are permitted
C. permitted are freshmen
D. are permitted freshmen
Only bu speaking with the microphone ______.
A. was he able to make himself hear
B. he was able to make himself hear
C. he was able to make himself heard
D. was he able to make himslef heard
______ when she started weeping.
A. Not until he arrived
B. Hardly had he arrived
C. No sooner had he arrived
D. Scarcely did he arrive
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