问题
选择题
Last week I met my friend Li Ming but I forgot _____ his telephone number. [ ]
A. ask
B. asking
C. and ask
D. to ask
答案
答案：D
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Last week I met my friend Li Ming but I forgot _____ his telephone number. [ ]
A. ask
B. asking
C. and ask
D. to ask
答案：D
，交流电动势的大小为 V。