问题
选择题
—__________ do you swim? —Twice a week.
A．How long
B．How many times
C．What time
D．How often
答案
答案：D
回答语表示的是频率，对此提问的用how often，故本题选D。
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—__________ do you swim? —Twice a week.
A．How long
B．How many times
C．What time
D．How often
答案：D
回答语表示的是频率，对此提问的用how often，故本题选D。
NO3溶液检验滤液中含有Cl-,此过程所发生的反应类型不包含 ( )