問題詳情：
—Listen! Who _____ in the music room?
—It must be Jane. She usually _____ at this time every day.
A. sings; sings B. is singing; is singing
C. sings; is singing D. is singing; sings
【回答】
D 根據listen可知應使用現在進行時；由usually和every day判斷應使用一般現在時，故選D。
知識點：動詞時態
題型：選擇題
