问题
选择题
_______ the teacher’s instruction in the lab_____ important.
A．Following; are
B．Following; is
C．Followed by; are
D．To follow; are
答案
答案：B
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_______ the teacher’s instruction in the lab_____ important.
A．Following; are
B．Following; is
C．Followed by; are
D．To follow; are
答案：B