在三角形ABC中∠A、∠B是锐角,等式acosB+bcosA=c成立的条件是[ ]
A.∠C是锐角
B.∠C是直角
C.∠C是钝角
D.上述三种情形都可以
答案:D
134-75+25=134-(75+25)______.
.I wish I________a chance to talk with you about my writing before you left yesterday.
A.have
B.had
C.had had
D.will have