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问题: 状语从句 .

The patients had to wait outside the room_____the doctor worked doubly fast.
A.until
B.unless
C.even if
D.before

解答:

C.even if 即使
The patients had to wait outside the room_____the doctor worked doubly fast.
即使医生双倍速度地工作,患者也不得不在门外等候。