______ has long been well known as a poet who can hardly be classified with the old o

Lao Lin has been working in the countryside for a long time, so he _______ farm work.

It has long been known that total sleep ______ is 100 percent fatal to rats, yet, upon exa

______is the only one well－known comedy by Eugene Galdstone ONeill.A．Ah, Wilderness!B．Long

－－－ __________？－－－ Two years ago.A. Where did he goB. How long has he been in AmericaC.

Cuts in funding have meant that equipment has been kept in service long after it______ hav

She should stop work; she has a headache because she______too long.A．is readingB．has been