问题
选择题
In the dark street, there wasn’t a single person _____ she could turn for help.
A．to whom
B．who
C．from whom
D．that
答案
A
turn to sb.求助于…
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In the dark street, there wasn’t a single person _____ she could turn for help.
A．to whom
B．who
C．from whom
D．that
A
turn to sb.求助于…
力大约只为牙周组织所能支持的力量的一半，而在牙周组织中储存了另一半的支持能力