—Did Alan enjoy seeing his old friends yesterday?—Yes, he did. He __________ his old friends for a long time.
#104601
A
didn’t see
B
wouldn’t see
C
hasn’t seen
D
hadn’t seen
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The doctors have recommended that she _______ on, but she has not yet made up her mind.
#103553
A
will be operated
B
is operated
C
be operated
D
was operated
I know Mr. Brown; we ______ to each other at an international conference.
#104101
A
are introduced
B
are been introduced
C
were introduced
D
had been introduced
—Boy students, could you come downstairs to help me carry those books?— OK, Miss Liu. We ______.
#100785
A
come
B
came
C
have come
D
are coming
Experiments of this kind ___in both the U．S and Europe well before the Second World War．
#100251
A
had conducted
B
have conducted
C
have been conducted
D
had been conducted
Helen ______ her keys in the office so she had to wait until her husband ______ home.
#102080
A
has left; comes
B
left; had come
C
had left; came
D
had left; would come