语法练习

1.They hurried there only to find the meeting cancelled. In fact, they ___ at all.

A.needn't have gone
B.must have gone
C.can't have gone
D.might have gone

2.You can arrive in Beijing earlier for the meeting ___ you don't mind taking the night train.

A.provided
B.unless
C.though
D.until

3.Staying in a hotel costs ___ renting a room.

A.as twice much as
B.twice as much as
C.as much twice as
D.as much twice

4.What blood vessel is to a man's body, ___ railway is to transportation.

A.that
B.so
C.as
D.it

5.Evidence comes up ___ specific speech sounds are recognized by babies as young as 6 months old.

A.what
B.which
C.that
D.whose

答案详解

1.[A]【解析】情态动词后的完成形式。needn't have done意为“本没必要……”；must have done表示“推测过去某事一定发生了”;can't/couldn't have done表示“过去不可能发生某事”；might have done表示“推测过去某事也许发生了”。因此，只有A项符合题意。句意：他们匆忙赶到那里，结果发现会议被取消了，事实上他们根本没必要去。

2.[A]【解析】状语从句。provided（that）是连接词，引导条件状语从句，意为“只要”。unless相当于“if...not”，意为“除非”。though意为“即使”。until意为“直到”。因此，根据题意A项正确。句意：只要你不介意坐夜班火车，就能早点来北京开会。

3.[B]【解析】倍数表示法。英语中有很多表示倍数的方式，其中一种便是用“倍数+as+副词/形容词+as”句型表示。因此，只有B项正确。句意：住旅馆是租房子费用的两倍。

4.[A]【解析】比喻结构。what C is to D, that A is to B是一种比喻结构，在此结构中，喻体在前，本体在后。因此，只有A项正确。句意：铁路对于运输，好比血管对于人体一样。

5.[C]【解析】同位语从句。that引导evidence的同位语从句，本句是同位语分隔结构。what，which，whose均不能引导同位语从句。故C项正确。句意：六个月的婴儿就能辨认特定话音的证据出现了。