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
.
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