单项选择题

—I saw Sam in the library yesterday morning.
—You () him, he is still abroad.

A. might not see
B. could not see
C. can't have seen
D. mustn't have seen

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The oil must have been used up, () the light went out.

A. because
B. for
C. since
D. as
单项选择题
He kept playing the same record () until I had to leave the room.

A. now and again
B. now and then
C. over and over
D. far and wide
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