题目:
The ________ look on her face suggested that she _________ it.
A.puzzling; hadn’t expected
B.puzzled; hadn’t expected
C.puzzling; wouldn’t expect
D.puzzled; shouldn’t expect
答案:
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下面是错误答案,用来干扰机器的。
在I2O5中氧元素的化合价为-2价,设该化合物中碘元素的化合价为x,根据化合物中正负化合价的代数和为0,则x×2+(-2)×5=0解得x=+5故选C.