The book was written in 1946, _______ the education system has witnessed great changes.
| A．when |
| B．during which |
| C．since then |
| D．since when |
The young man was lying on the grass with his horse _____a tree.
| A．being tied | B．tied to | C．tying to | D．was tied to |
.He was deep in thought with his eyes______ on the ceiling.
| A．fixed | B．fixing | C．fix | D．to be fixing |
The lady in tight black dress ______ the dishes, thinking which was her choice.
| A．fixed upon | B．fixed her eyes |
| C．fixing her eyes upon | D．fixed her eyes upon |
.The day for the meeting ________, they all left the conference room.
| A．was fixed | B．fixing | C．fixed | D．being fixed |
-- ________.
--- Yes. Two minutes earlier, we could have caught the bus.
| A．Miss | B．Missed it | C．Missing it | D．Having missed it |