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【简答题】
若集合A=,且集合A有且仅有两个子集,则实数a=____.
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【单选题】Everyone has periods in their lives ______ everything seems very hard.
A.
when
B.
where
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which
D.
That
【简答题】Everyone has periods in their lives_______everything seems very hard. A．when B．where C．which D．that
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【单选题】Everyone has periods in their lives__________everything seems so hard.
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when
B.
where
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which
D.
that
【单选题】Everyone has periods in their lives ______ everything seems very hard.
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when
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where
C.
which
D.
that
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D.
that
【简答题】Everyone has periods in their lives _______ everything seems so hard.
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