Question

-- Tommy, your mum has been out without glasses!
-- Well, take it easy.         she is back home for them.

A．It is long before that	B．It won't be long since
C．It won't be long before	D．It will be long before

Answer 1

C

試題分析：考查句型：It will be +一段時間+before…,要多長時間才…，句意：--Tommy，你媽媽沒帶眼鏡就出去了，沒關(guān)系，不要多久她就會回來拿的。選C。
點評：固定句型：It was+一段時間+before…，要多久…就（才）…，容易混淆的句型是it is/has been 一段時間since從句（過去時）；自從…以來，已經(jīng)有一段時間了。