下列说法正确的是( )
①水银不是银②干冰不是冰③铅笔不含铅④金刚石不含金.
A.①④
B.②
C.②③
D.①②③④
答案:D
If there were no exams and parents meetings, high school life __ much enjoyable.
A.will be
B.must be
C.would be
D.would have been
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