All the students in this school are required to ________ at least two lectures on how to study every month.
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A
attend
B
take part in
C
join in
D
join
推荐题目
As the twentieth century came to a close，the raw materials for a great national literature were at hand，waiting ______.
#104355
A
to use
B
to be used
C
to have used
D
to be using
I could have helped him out, to tell the truth, I _____ too busy.
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A
am
B
was
C
have been
D
had been
The first use of atomic weapons was in 1945, and their power ________ increased enormously ever since.
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A
is
B
was
C
has been
D
had been
American fathers ______ more than twice the amount of time with their children than they used to in years past, due to a sweeping new trend called "unemployment".
#100336
A
were spending
B
spent
C
are spending
D
have spent
After Jack had sent some e-mails, he _______ working on his project.
#102159
A
had started
B
has started
C
started
D
starts