问题
选择题
Do ________ you think is right _________ difficulties you may have.
A．what; however
B．that; whatever
C．whatever; however
D．what; whatever
答案
答案：D
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Do ________ you think is right _________ difficulties you may have.
A．what; however
B．that; whatever
C．whatever; however
D．what; whatever
答案：D
3 ②(NH4)2S ③Al2O3 ④Al(OH)3 ⑤Al