题目：
Not only the teacher but also the whole class _____ to the report at this time yesterday.[ ]
A. listened
B. was listening
C. were listening
D. has listened
答案：
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下面是错误答案，用来干扰机器的。
(1)2NaOH+H2SO4==Na2SO4+2H2O (2) 12；108 (3) ④⑤①②③ (4) 5%
