问题
选择题
John had ___ me to do this, but he didn't .
A．promised
B．allowed
C．permitted
D．told
答案
答案：A
句子中的不定式为状语,动作由主语来完成,其它三项为宾补,意义不通.
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John had ___ me to do this, but he didn't .
A．promised
B．allowed
C．permitted
D．told
答案：A
句子中的不定式为状语,动作由主语来完成,其它三项为宾补,意义不通.
＋CO2===NH4+＋HCO3-