【題目】Jason usually spends half an hour __________ his homework every night.
A.in
B.on
C.at
D.to

【答案】B
【解析】spend some time on sth.為固定短語,意為“在某事/某物上花費時間”。故選B。句意是:杰森每天晚上花半個小時做家庭作業(yè)。

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