难以改变的;难以击败的;顽强的;固执的;执拗的;倔强的
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Vitamins should not be a _for a healthy diet.
A. substitute
B. healthy
C. substitu
D. nothing
I think of _as impossible.
A. it
B. this
C. why
D. what
He appears to be strong and healthy ,but,as a matter of fact.
A. 对
B. 错