题目内容
-May I speak to __________ Professor Black, please?
-Sorry, but he is busy conducting ____________ experiment in the lab right now.
A.the; an B.a; the C.不填; an D.the; the
C
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―Hello!May I speak to Jack, please?
―Yes, speaking.
-Oh, I _______ your voice at first.
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A.don’t recognize. |
B.didn’t recognize. |
|
C.hadn’t recognized. |
D.haven’t recognized. |