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【单选题】
如果一个数的平方等于它的倒数，那么这个数一定是（ ）A.
0
B.
1
C.
-1
D.
±1
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举一反三
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A.
have gone
B.
have been gone
C.
have been going
D.
are being gone
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A.
Have: gone to
B.
Have; gone
C.
Have: been to
D.
Have: been in
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A.
must have gone
B.
should have gone
C.
ought to have gone
D.
could have gone
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A.
shouldn’t have gone
B.
might have gone
C.
needn’t have gone
D.
must have gone
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A.
have; been to
B.
have; been
C.
have; gone to
D.
have; gone
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A.
have gone to
B.
have been to
C.
have gone in
D.
has been on
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