问题
选择题
.
It is difficult for any of us to eat better, exercise more, and sleep enough,________ we know we should.
A．because
B．even if
C．unless
D．before
答案
答案：B
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.
It is difficult for any of us to eat better, exercise more, and sleep enough,________ we know we should.
A．because
B．even if
C．unless
D．before
答案：B