问题
选择题
It was she that ________a sharp whistle, which makes ________possible for us to catch the thief.
A．gave off; this
B．gave out; that
C．gave; it
D．sent out; them
答案
答案：C
前半句即主句是强调句，强调she；后半句是which引导的非限制生定语从句，it为形式宾语，指代真正的宾语即动词不定式短语to catch the thief.