问题
选择题
There was _____ general expectation that _____ most students would pass the exam. [ ]
A. a; ∕
B. a; the
C. ∕; ∕
D. ∕; the
答案
答案：A
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There was _____ general expectation that _____ most students would pass the exam. [ ]
A. a; ∕
B. a; the
C. ∕; ∕
D. ∕; the
答案：A
2H2O
CaO + CO2↑