顺序栈所有操作的时间和空间复杂度都很低，因此，顺序栈是一种高效的存储结构（ ）。
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Some people say that a mushroom is edible if it can be ____.
A. peeled easy
B. easy peel
C. peeled easily
D. easily peel
"Is Dave about ready?" "Yes, he's ____."
A. finished dressing nearly
B. finishing nearly dressing
C. nearly finished dressing
D. nearly finishing dressing
The famous painting has been hanging ____.
A. on that room for a long time
B. on that wall many years ago
C. on that wall for many years
D. on that wall in 1898
"Has everyone gone?" "Some students ____."
A. are still here
B. are already here
C. are still gone
D. are still yet
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