单项选择题

The children () very quiet; I wonder what they()up to.

A. were; are being
B. are being; are
C. are; do
D. are being; do

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单项选择题
—()you () the editor at the airport —No, he () away before my arrival.

A. Have...met; has driven
B. Had...met; was driven
C. Did...meet; had been driven
D. Have...met; had driven
单项选择题
He’s working hard for fear that he ()

A. should fall behind
B. fell behind
C. may fall behind
D. would fallen behind
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