[例1]Roses need special care______they can live through winter.
A.because B.so that C.even if D.as
【解析】答案B。so that引導目的狀語從句，“為了”。
[例2]______you call me to say you’re not coming，I’ll see you at the theatre.
A.Though B.Whether C.Until D.Unless
【解析】答案D。unless引導條件狀語從句，表示“除非，如果不”。
[例3]Several weeks had gone by ______I realized the painting was missing.
A.as B.before C.since D.when
【解析】答案B。before這裏表示“過了……（時間）才”，引導時間狀語從句。
[例4]I do every single bit of housework______my husband Bob just does the dishes now and then.
A.since B.while C.when D.as
【解析】答案B。while表示前後對比，“然而，可是”。
[例5]Jasmine was holidaying with her family in a wildlife park______she was bitten on the leg by a lion.
A.when B.while C.since D.once
【解析】答案A。when是等立連詞，表示“正在這時”。
[例6]Parents should take seriously their children’s requests for sunglasses______eye protection is necessary in sunny weather.
A.because B.through C.unless D.if
【解析】答案A。because引導原因狀語從句。
[例7]It was evening______we reached the little town of Winchester.
A.that B.until C.since D.before
【解析】答案D。before引導時間狀語從句，表示“在……之前”。
[例8]You can eat food free in my restaurant______you like.
A.whenever B.wherever C.whatever D.however
【解析】答案A。whenever引導讓步狀語從句，意為“無論何時”。
[例9]It was______back home after the experiment.
A.not until midnight did he go
B.until midnight that he didn’t go
C.not until midnight that he went
D.until midnight when he didn’t go
【解析】答案C。這是“It was not until…that…”引起的強調句型。