請看下面一道題：

If a book is in English, _________ means slow progress for you.A. as????????????????????? B. which????????????????????? C. what?????????????????????? D. that
【分析】此題容易誤選 A或B，想當(dāng)然地根據(jù)空格前的逗號認(rèn)為這是非限制性定語從句。這樣分析的同學(xué)，主要是忽略了前一句句首的 if。其實此題應(yīng)選D，逗號前是一個條件狀語從句，逗號后是該狀語從句的主句，that 在此代表前文所述的意思，用作主句的主語。同樣地，下面幾題也應(yīng)選 that，而不選 which：

which(1) If he’s only interested in your looks, _________ just shows how shallow he is.A. as??????????????????????? B. which??????????????????????? C. what?????????????????????? D. that(2) If you want to go, _________is quite all right with me. A. that????????????????????? B. which??????????????????????? C. and it????????????????????? D. so(3) When I say two hours, _________ includes time for eating. A. as??????????????????????? B. which??????????????????????? C. what?????????????????????? D. that(4) If you want a double room , _________ will cost another ￡15. A. as??????????????????? &nbew sp;?? B. which??????????????????????? C.? what????????????????????? D. that(5) If you have the money, _________ will be OK.A. as??????????????????????? B. which??????????????????????? C. and it????????????????????? D. that
下例也選 that 而不選 which，其中 that 表示“那”：

Unless I’m very much mistaken, _________ is my watch you’re wearing! A. as??????????????????????? B. which??????????????????????? C. what??????????????????????? D. that