单项选择题
— What's the problem, Harry? --- （）
A.No problem B.No trouble at all C.Thank you for asking me about it D.I can’t remember where I left my glasses
单项选择题 The big man has always been eating on the go,（）he has got stomachache.
单项选择题 Great changes （） in China since 1978.
单项选择题 Electricity （） by the Greeks a good many years ago.
