Question

It is necessary that an efficient worker ____his work on time.

It is necessary that an efficient worker ____his work on time. a.accomplishes b.can accomplish c.accomplish d.will accomplish 希望高手能解答并说明一下原因。

Answer 1

选accomplish。
本句句首的it作形式主语，真正的主语是that引导的从句，即:that
an
efficient
worker
...
on
time。that引导的主语从句采用了虚拟语气，其完整的形式为it
is
necessary
that
an
efficient
worker
(should)
accomplish
his
work
on
time.
本句省略了主句从句中的should，因此accomplish为正确答案。
plus:
虚拟语气与不定式
1.it
is
necessary
+
that
...
的结构中，that引导的主语从句的谓语动词要用虚拟语气，即
should
+
动词原形，其中的should
可省略。
e.g.
it
is
necessary
that
we
(should)
finish
the
task
tomorrow.
2.
在不定式作形容词的主语的句式中，it
is
necessary
+
不定式
e.g.
it
is
necessary
for
you
to
lock
the
car
when
you
do
not
use
it.