al,he put on a show as though his trip _____ a great success.

Scientists say it will be five or six years _____ it is possible to test this medicine on human patients.

下列各句中，没有语病的一句是（ ）

ce is considered a ________ lady by us, for sheoften helps the poor she met with.

Did you enjoy meeting your old schoolmates at the party last week?—Yes, I didWe ________ each other since we graduated from college