在气相色谱法中,某组分的保留时间为5min,空气的保留时间为1min,某组分的调整保留时间为()。
A.1min
B.2min
C.3min
D.4min
E.5min
参考答案:D
My family _____________ three members.[ ]
A. is
B. has
C. have
---What did your mother say on the phone just now?
--- She asked me _____ I was getting on well with my new classmates.
A.that
B.if
C.how
D.what