A：who
B：that
C：whom
D：whose
do you like? The red one.
— should we clean the library?
—Twice a week．
①我正做完功课，李青就来叫我了。
②推开房门，只见忘菊两乌黑的大眼睛紧紧地闭着。
③会场上响起了热烈的雷鸣般的、经久不息的掌声。
