單項選擇題When he suddenly() up the subject of genetic engineering, there was an embarrassed silence.

A.took
B.brought
C.showed
D.came


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1.單項選擇題The problem()when the students refused to do their homework.

A.arose
B.aroused
C.rose
D.raised

2.單項選擇題Speaker A: Want to come over Thursday for supper? Speaker B:()

A.I really can't. You'll not mind, I think
B.Let's put it off till later
C.Thanks, but I have to work that evening
D.No, I don't want to