单项选择题
I’ve always longed for the time（）I should be able to be independent.
A. that B. which C. when D. while
单项选择题 There aren’t many wild pandas ()in the world today.
单项选择题 It’s a pity that some of the people（）cannot come to the party.
单项选择题 You can never imagine what great trouble I have had () the patient who received a serious wound
