题目内容：
_____ worries me that he keeps changinghis mind.
A. This
B. That
C. What
D. It
参考答案：
单选题：_____ worries me that he keeps changinghis mind.[ ]A. This..
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A. This
B. That
C. What
D. It
A. This
B. That
C. What
D. It
Did he find_____ hard to learn a foreign language?[ ]A. th..
Did he find_____ hard to learn a foreign language?[ ]A. thatB. himC. itD. himself
He didn't make _____ clear when and where the meeting would..
He didn't make _____ clear when and where the meeting would be held.[ ]A. theseB. thisC. itD. that
—Who should be responsible for the accident?— The boss, not..
—Who should be responsible for the accident?— The boss, not the workers. They just carry out the order _____. [ ]A. as told B. as are told C. as telling D. as they told
When and where to build the new factory _____not decided yet..
When and where to build the new factory _____not decided yet .A．isB．areC．hasD． have
New technologies have made ________ possible to turn out new..
New technologies have made ________ possible to turn out new products faster and at a lower cost. [ ]A. that B. this C. one D. it